A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes out-of-bounds write. The attack requires access to the local network. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Metrics

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Adjacent Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Davenardella
  • Snap7

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References
Link Providers
https://github.com/davenardella/snap7/ cve-icon cve-icon
https://github.com/davenardella/snap7/issues/16 cve-icon cve-icon
https://github.com/user-attachments/files/28681740/poc.zip cve-icon cve-icon
https://vuldb.com/cve/CVE-2026-15105 cve-icon cve-icon
https://vuldb.com/submit/851026 cve-icon cve-icon
https://vuldb.com/vuln/376946 cve-icon cve-icon
https://vuldb.com/vuln/376946/cti cve-icon cve-icon
History

Sat, 01 Aug 2026 15:15:00 +0000

Type Values Removed Values Added
Description A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes deserialization. The attack requires access to the local network. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet. A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes out-of-bounds write. The attack requires access to the local network. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Title davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead deserialization davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead out-of-bounds write
Weaknesses CWE-20
CWE-502		 CWE-119
CWE-787

Thu, 09 Jul 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 08 Jul 2026 22:30:00 +0000

Type Values Removed Values Added
Description A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes deserialization. The attack requires access to the local network. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Title davenardella snap7 ReadVar Request s7_server.cpp PerformFunctionRead deserialization
First Time appeared Davenardella
Davenardella snap7
Weaknesses CWE-20
CWE-502
CPEs cpe:2.3:a:davenardella:snap7:*:*:*:*:*:*:*:*
Vendors & Products Davenardella
Davenardella snap7
References
Metrics cvssV2_0

{'score': 5.8, 'vector': 'AV:A/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 6.3, 'vector': 'CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-07-08T22:15:12.176Z

Updated: 2026-08-01T14:56:11.532Z

Reserved: 2026-07-08T17:07:19.722Z

Link: CVE-2026-15105

cve-icon Vulnrichment

Updated: 2026-07-09T13:21:32.397Z

cve-icon NVD

Status : Deferred

Published: 2026-07-08T23:16:51.600

Modified: 2026-08-01T15:16:33.887

Link: CVE-2026-15105

cve-icon Redhat

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