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CVE-2026-2967

MEDIUM CVSS 4.0: 6.3 EPSS 0.22%
Updated Feb 23, 2026
Cesanta
Parameter Value
CVSS 6.3 (MEDIUM)
Affected Versions before 7.20
Type CWE-940
Vendor Cesanta
Public PoC No

A security vulnerability has been detected in Cesanta Mongoose up to 7.20. This affects the function getpeer of the file /src/net_builtin.c of the component TCP Sequence Number Handler. The manipulation leads to improper verification of source of a communication channel.

The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is reported as difficult.

The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption

CVSS Vector v4.0

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Cesanta Mongoose
cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*
<= 7.20