Vulnerability in Cesanta Mongoose
CVE-2026-2967
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 so…
EPSS: 0.002 (46.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Cesanta Mongoose — versions 7.0, 7.1, 7.2
Weakness classification (CWE)
References
- VDB-347334 | Cesanta Mongoose TCP Sequence Number net_builtin.c getpeer verification of source (technical-description, Third Party Advisory, VDB Entry, vdb-entry)
- VDB-347334 | CTI Indicators (IOB, IOC, IOA) (signature, Permissions Required, permissions-required, VDB Entry)
- Submit #755450 | Cesanta Mongoose Embedded Web Server 7.20 Improper Validation of Specified Index, Position, or Offset in I (Third Party Advisory, VDB Entry, third-party-advisory)
- cna@vuldb.com (related, Exploit, Third Party Advisory)
- cna@vuldb.com (Exploit, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-2967?
- CVE-2026-2967 is a low-severity vulnerability in Cesanta Mongoose, classified under Improper Verification of Source of a Communication Channel. CVSS score: 3.7/10. Published 2026-02-23.
- How severe is CVE-2026-2967?
- Low severity. CVSS v3 base score is 3.7 out of 10.