CVE-2024-6858 - Vulnerability Details - OpenCVE

In Arista’s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed access to a switch port if there exists an EAPOL capable device in the fallback VLAN.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Arista	Eos

No data.

No data.

References

Link	Providers
https://www.arista.com/en/support/advisories-notices/security-advisory/19917-security-advisory-0103

History

Fri, 05 Jun 2026 21:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 6.5, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Fri, 05 Jun 2026 10:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Arista Arista eos
Vendors & Products		Arista Arista eos

Thu, 04 Jun 2026 22:15:00 +0000

Type	Values Removed	Values Added
Description		In Arista’s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed access to a switch port if there exists an EAPOL capable device in the fallback VLAN.
Title		In Arista’s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed access to a switch port if there exists an EAPOL capable device in the fallback VLAN.
Weaknesses		CWE-1287
References		https://www.arista.com/en/support/advisories-notices/security-advisory/19917-security-advisory-0103

MITRE

Status: PUBLISHED

Assigner: Arista

Published: 2026-06-04T21:51:08.709Z

Updated: 2026-06-05T20:13:59.275Z

Reserved: 2024-07-17T20:13:57.799Z

Link: CVE-2024-6858

Vulnrichment

Updated: 2026-06-05T20:13:52.087Z

NVD

Status : Awaiting Analysis

Published: 2026-06-04T22:16:51.843

Modified: 2026-06-05T21:16:27.760

Link: CVE-2024-6858

Redhat

No data.

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Please note the default host-mode is multi-host.\n\n\n\nswitch(config-if-et1)#show active\ninterface Ethernet1\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0dot1x pae authenticator\n\n\u00a0\u00a0\u00a0dot1x port-control auto\n\n\u00a0\u00a0\u00a0dot1x host-mode multi-host\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\n\nAND\n(2) Fallback VLAN should be configured on port. Fallback VLAN can be configured in any of the following ways listed below;\n\n\n\n(2-a) Global Configuration for unresponsive VLAN.\n\n\n\nswitch(config-dot1x)#show active\ndot1x\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0aaa unresponsive action traffic allow vlan <vlan-id>\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n \nOR\n \nswitch(config-dot1x)#show active\ndot1x\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0aaa unresponsive action traffic allow\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-b) Global Configuration for unresponsive phone VLAN.\n\n\n\nswitch(config-dot1x)#show active\ndot1x\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0aaa unresponsive phone action traffic allow\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-c) Global Configuration for guest VLAN.\n\n\n\nswitch(config-dot1x)#show active\ndot1x\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0eapol unresponsive action traffic allow vlan <vlan-id>\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-d) Authentication failure VLAN configured on port.\n\n\n\nswitch(config-if-et1)#show active\ninterface Ethernet1\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0dot1x authentication failure action traffic allow vlan <vlan_id>\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-e) Unresponsive VLAN configured on port.\n\n\n\nswitch(config-if-et1)#show active\ninterface Ethernet1\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0dot1x aaa unresponsive action traffic allow vlan <vlan_id>\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-f) Unresponsive phone VLAN configured on port.\n\n\n\nswitch(config-if-et1)#show active\ninterface Ethernet1\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0dot1x aaa unresponsive phone action traffic allow\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>In order to be vulnerable to CVE-2024-6858, the following conditions must be met:</p><p>(1) dot1x should be configured on port as authenticator and port-control is auto mode and hostMode is multi-host. Please note the default host-mode is multi-host.</p><pre>switch(config-if-et1)#show active\ninterface Ethernet1\n   \u2026\u2026\u2026\u2026\n   dot1x pae authenticator<br>\n   dot1x port-control auto<br>\n   dot1x host-mode multi-host\n   \u2026\u2026\u2026\u2026\n</pre><p>AND<br>(2) Fallback VLAN should be configured on port. Fallback VLAN can be configured in any of the following ways listed below;</p><p>(2-a) Global Configuration for unresponsive VLAN.</p><pre>switch(config-dot1x)#show active\ndot1x\n   \u2026\u2026\u2026\u2026\n   aaa unresponsive action traffic allow vlan <vlan-id>\n   \u2026\u2026\u2026\u2026\n \nOR\n \nswitch(config-dot1x)#show active\ndot1x\n   \u2026\u2026\u2026\u2026\n   aaa unresponsive action traffic allow\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-b) Global Configuration for unresponsive phone VLAN.</div><pre>switch(config-dot1x)#show active\ndot1x\n   \u2026\u2026\u2026\u2026\n   aaa unresponsive phone action traffic allow\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-c) Global Configuration for guest VLAN.</div><pre>switch(config-dot1x)#show active\ndot1x\n   \u2026\u2026\u2026\u2026\n   eapol unresponsive action traffic allow vlan <vlan-id>\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-d) Authentication failure VLAN configured on port.</div><pre>switch(config-if-et1)#show active\ninterface Ethernet1\n   \u2026\u2026\u2026\u2026\n   dot1x authentication failure action traffic allow vlan <vlan_id>\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-e) Unresponsive VLAN configured on port.</div><pre>switch(config-if-et1)#show active\ninterface Ethernet1\n   \u2026\u2026\u2026\u2026\n   dot1x aaa unresponsive action traffic allow vlan <vlan_id>\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-f) Unresponsive phone VLAN configured on port.</div><pre>switch(config-if-et1)#show active\ninterface Ethernet1\n   \u2026\u2026\u2026\u2026\n   dot1x aaa unresponsive phone action traffic allow\n   \u2026\u2026\u2026\u2026</pre>"}]}], "workarounds": [{"lang": "en", "value": "This vulnerability arises when there is an EAPOL supplicant in any of the fallback VLAN\u2019s ( i.e. auth-fail, unresponsive VLAN ). If only unauthenticated EAPOL supplicants are expected the admin can change dot1x host-mode to single-host as indicated below.\n\n\n\nswitch(config-if-et1)#dot1x host-mode single-host\n\n\n * Dot1x Host Mode\n * \n\nSingle Host Mode: Please note when once the 802.1X supplicant is authenticated on the port, ONLY the traffic coming from the supplicant's MAC is allowed through the port.\n\n\n * \n\nMulti-Host Mode: Once the 802.1X supplicant is authenticated on the port, traffic coming from ANY source MAC is allowed through the port.\n\n\n * \n\nMulti-Host authenticated Mode: Multiple 802.1X supplicants can be allowed and ONLY the traffic coming from all authenticated supplicant\u2019s MAC is allowed through the port.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>This vulnerability arises when there is an EAPOL supplicant in any of the fallback VLAN\u2019s ( i.e. auth-fail, unresponsive VLAN ). If only unauthenticated EAPOL supplicants are expected the admin can change dot1x host-mode to single-host as indicated below.</p><pre>switch(config-if-et1)#dot1x host-mode single-host\n</pre><ul><li>Dot1x Host Mode<br><ul><li><p>Single Host Mode: Please note when once the 802.1X supplicant is authenticated on the port, ONLY the traffic coming from the supplicant's MAC is allowed through the port.</p></li><li><p>Multi-Host Mode: Once the 802.1X supplicant is authenticated on the port, traffic coming from ANY source MAC is allowed through the port.</p></li><li><p>Multi-Host authenticated Mode: Multiple 802.1X supplicants can be allowed and ONLY the traffic coming from all authenticated supplicant\u2019s MAC is allowed through the port.</p></li></ul></li></ul>"}]}], "solutions": [{"lang": "en", "value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see\u00a0 EOS User Manual: Upgrades and Downgrades https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades \n\nCVE-2024-6858 has been fixed in the following releases:\n\n * 4.31.2F and later releases in the 4.31.x train.\n * 4.30.6M and later releases in the 4.30.x train.\n * 4.29.8M and later releases in the 4.29.x train.\n * 4.28.11M and later releases in the 4.28.x train.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see <a href=\"https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades\" target=\"_blank\" rel=\"noopener noreferrer\">EOS User Manual: Upgrades and Downgrades</a></p><div>CVE-2024-6858 has been fixed in the following releases:</div><ul><li>4.31.2F and later releases in the 4.31.x train.</li><li>4.30.6M and later releases in the 4.30.x train.</li><li>4.29.8M and later releases in the 4.29.x train.</li><li>4.28.11M and later releases in the 4.28.x train.</li></ul>"}]}], "source": {"defect": ["BUG 828435"], "advisory": "103", "discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-06-05T20:13:55.762154Z", "id": "CVE-2024-6858", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-05T20:13:59.275Z"}}]}}

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Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see\u00a0 EOS User Manual: Upgrades and Downgrades https://www.arista.com/en/um-eos/eos-upgrades-and-downgrades \n\nCVE-2024-6858 has been fixed in the following releases:\n\n * 4.31.2F and later releases in the 4.31.x train.\n * 4.30.6M and later releases in the 4.30.x train.\n * 4.29.8M and later releases in the 4.29.x train.\n * 4.28.11M and later releases in the 4.28.x train.", "supportingMedia": [{"type": "text/html", "value": "<p>The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. 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If only unauthenticated EAPOL supplicants are expected the admin can change dot1x host-mode to single-host as indicated below.\n\n\n\nswitch(config-if-et1)#dot1x host-mode single-host\n\n\n * Dot1x Host Mode\n * \n\nSingle Host Mode: Please note when once the 802.1X supplicant is authenticated on the port, ONLY the traffic coming from the supplicant's MAC is allowed through the port.\n\n\n * \n\nMulti-Host Mode: Once the 802.1X supplicant is authenticated on the port, traffic coming from ANY source MAC is allowed through the port.\n\n\n * \n\nMulti-Host authenticated Mode: Multiple 802.1X supplicants can be allowed and ONLY the traffic coming from all authenticated supplicant\u2019s MAC is allowed through the port.", "supportingMedia": [{"type": "text/html", "value": "<p>This vulnerability arises when there is an EAPOL supplicant in any of the fallback VLAN\u2019s ( i.e. auth-fail, unresponsive VLAN ). If only unauthenticated EAPOL supplicants are expected the admin can change dot1x host-mode to single-host as indicated below.</p><pre>switch(config-if-et1)#dot1x host-mode single-host\n</pre><ul><li>Dot1x Host Mode<br><ul><li><p>Single Host Mode: Please note when once the 802.1X supplicant is authenticated on the port, ONLY the traffic coming from the supplicant's MAC is allowed through the port.</p></li><li><p>Multi-Host Mode: Once the 802.1X supplicant is authenticated on the port, traffic coming from ANY source MAC is allowed through the port.</p></li><li><p>Multi-Host authenticated Mode: Multiple 802.1X supplicants can be allowed and ONLY the traffic coming from all authenticated supplicant\u2019s MAC is allowed through the port.</p></li></ul></li></ul>", "base64": false}]}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "descriptions": [{"lang": "en", "value": "In Arista\u2019s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed access to a switch port if there exists an EAPOL capable device in the fallback VLAN.", "supportingMedia": [{"type": "text/html", "value": "In Arista\u2019s EOS when in 802.1X mode, multi-auth unauthenticated hosts might be allowed access to a switch port if there exists an EAPOL capable device in the fallback VLAN.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1287", "description": "CWE-1287 Improper validation of specified type of input"}]}], "configurations": [{"lang": "en", "value": "In order to be vulnerable to CVE-2024-6858, the following conditions must be met:\n\n\n\n(1) dot1x should be configured on port as authenticator and port-control is auto mode and hostMode is multi-host. Please note the default host-mode is multi-host.\n\n\n\nswitch(config-if-et1)#show active\ninterface Ethernet1\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0dot1x pae authenticator\n\n\u00a0\u00a0\u00a0dot1x port-control auto\n\n\u00a0\u00a0\u00a0dot1x host-mode multi-host\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\n\nAND\n(2) Fallback VLAN should be configured on port. Fallback VLAN can be configured in any of the following ways listed below;\n\n\n\n(2-a) Global Configuration for unresponsive VLAN.\n\n\n\nswitch(config-dot1x)#show active\ndot1x\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0aaa unresponsive action traffic allow vlan <vlan-id>\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n \nOR\n \nswitch(config-dot1x)#show active\ndot1x\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0aaa unresponsive action traffic allow\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-b) Global Configuration for unresponsive phone VLAN.\n\n\n\nswitch(config-dot1x)#show active\ndot1x\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0aaa unresponsive phone action traffic allow\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-c) Global Configuration for guest VLAN.\n\n\n\nswitch(config-dot1x)#show active\ndot1x\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0eapol unresponsive action traffic allow vlan <vlan-id>\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-d) Authentication failure VLAN configured on port.\n\n\n\nswitch(config-if-et1)#show active\ninterface Ethernet1\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0dot1x authentication failure action traffic allow vlan <vlan_id>\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-e) Unresponsive VLAN configured on port.\n\n\n\nswitch(config-if-et1)#show active\ninterface Ethernet1\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0dot1x aaa unresponsive action traffic allow vlan <vlan_id>\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\n\n\u00a0\n\nOR\n(2-f) Unresponsive phone VLAN configured on port.\n\n\n\nswitch(config-if-et1)#show active\ninterface Ethernet1\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026\n\u00a0\u00a0\u00a0dot1x aaa unresponsive phone action traffic allow\n\u00a0\u00a0\u00a0\u2026\u2026\u2026\u2026", "supportingMedia": [{"type": "text/html", "value": "<p>In order to be vulnerable to CVE-2024-6858, the following conditions must be met:</p><p>(1) dot1x should be configured on port as authenticator and port-control is auto mode and hostMode is multi-host. Please note the default host-mode is multi-host.</p><pre>switch(config-if-et1)#show active\ninterface Ethernet1\n   \u2026\u2026\u2026\u2026\n   dot1x pae authenticator<br>\n   dot1x port-control auto<br>\n   dot1x host-mode multi-host\n   \u2026\u2026\u2026\u2026\n</pre><p>AND<br>(2) Fallback VLAN should be configured on port. Fallback VLAN can be configured in any of the following ways listed below;</p><p>(2-a) Global Configuration for unresponsive VLAN.</p><pre>switch(config-dot1x)#show active\ndot1x\n   \u2026\u2026\u2026\u2026\n   aaa unresponsive action traffic allow vlan <vlan-id>\n   \u2026\u2026\u2026\u2026\n \nOR\n \nswitch(config-dot1x)#show active\ndot1x\n   \u2026\u2026\u2026\u2026\n   aaa unresponsive action traffic allow\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-b) Global Configuration for unresponsive phone VLAN.</div><pre>switch(config-dot1x)#show active\ndot1x\n   \u2026\u2026\u2026\u2026\n   aaa unresponsive phone action traffic allow\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-c) Global Configuration for guest VLAN.</div><pre>switch(config-dot1x)#show active\ndot1x\n   \u2026\u2026\u2026\u2026\n   eapol unresponsive action traffic allow vlan <vlan-id>\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-d) Authentication failure VLAN configured on port.</div><pre>switch(config-if-et1)#show active\ninterface Ethernet1\n   \u2026\u2026\u2026\u2026\n   dot1x authentication failure action traffic allow vlan <vlan_id>\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-e) Unresponsive VLAN configured on port.</div><pre>switch(config-if-et1)#show active\ninterface Ethernet1\n   \u2026\u2026\u2026\u2026\n   dot1x aaa unresponsive action traffic allow vlan <vlan_id>\n   \u2026\u2026\u2026\u2026\n</pre><div> </div><div>OR<br>(2-f) Unresponsive phone VLAN configured on port.</div><pre>switch(config-if-et1)#show active\ninterface Ethernet1\n   \u2026\u2026\u2026\u2026\n   dot1x aaa unresponsive phone action traffic allow\n   \u2026\u2026\u2026\u2026</pre>", "base64": false}]}], "providerMetadata": {"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "shortName": "Arista", "dateUpdated": "2026-06-04T21:51:08.709Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2024-6858", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-05T20:13:55.762154Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-06-05T20:13:52.087Z"}}]}, "cveMetadata": {"cveId": "CVE-2024-6858", "state": "PUBLISHED", "dateUpdated": "2026-06-04T21:51:08.709Z", "dateReserved": "2024-07-17T20:13:57.799Z", "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "datePublished": "2026-06-04T21:51:08.709Z", "assignerShortName": "Arista"}, "dataVersion": "5.2"}