CVE-2026-2967

low-risk
Published 2026-02-23

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.

Do I need to act?

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0.22% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.7/10 Low
NETWORK / HIGH complexity

Affected Products (1)

Affected Vendors

Cesanta

References (5)

Exploit https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md
Exploit https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md#poc
Permissions Required https://vuldb.com/?ctiid.347334
Third Party Advisory https://vuldb.com/?id.347334
Third Party Advisory https://vuldb.com/?submit.755450
19
/ 100
low-risk
Severity 13/34 · Low
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal