A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Metrics

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Access Vector Network

Access Complexity High

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Cesanta
  • Mongoose

Configuration 1 [-]

cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*

No data.

References
Link Providers
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md cve-icon cve-icon
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/mg_sendnsreq.md#poc cve-icon cve-icon
https://vuldb.com/?ctiid.347333 cve-icon cve-icon
https://vuldb.com/?id.347333 cve-icon cve-icon
https://vuldb.com/?submit.755304 cve-icon cve-icon
History

Mon, 23 Feb 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Mon, 23 Feb 2026 02:30:00 +0000

Type Values Removed Values Added
Description A weakness has been identified in Cesanta Mongoose up to 7.20. The impacted element is the function mg_sendnsreq of the file /src/dns.c of the component DNS Transaction ID Handler. Executing a manipulation of the argument random can lead to insufficiently random values. The attack can be launched remotely. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Title Cesanta Mongoose DNS Transaction ID dns.c mg_sendnsreq random values
First Time appeared Cesanta
Cesanta mongoose
Weaknesses CWE-310
CWE-330
CPEs cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*
Vendors & Products Cesanta
Cesanta mongoose
References
Metrics cvssV2_0

{'score': 2.6, 'vector': 'AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 3.7, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-02-23T02:02:08.202Z

Updated: 2026-02-23T13:36:51.905Z

Reserved: 2026-02-22T07:57:24.272Z

Link: CVE-2026-2966

cve-icon Vulnrichment

Updated: 2026-02-23T13:36:44.960Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-23T03:15:59.373

Modified: 2026-02-23T20:18:06.617

Link: CVE-2026-2966

cve-icon Redhat

No data.