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 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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (51.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002
Affected products
- Cesanta Mongoose — versions 7.0, 7.1, 7.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, Permissions Required, permissions-required, VDB Entry)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md (related, Exploit, Third Party Advisory)
- github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md (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.