CVE-2026-2967
Cesanta Mongoose TCP Sequence Number net_builtin.c getpeer verification of source
LOW 2.9EPSS 0.7%
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.
- Affected
- Cesanta · Mongoose
- CVSS v4.0 VULDB
- 2.9 LOW
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 VULDB
- 3.7 LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L - CVSS v2.0 VULDB
- 2.6 LOW
AV:N/AC:H/Au:N/C:N/I:N/A:P - EPSS
- 0.72% chance of exploitation in the next 30 days, 53rd percentile
- Published
- 2026-02-23
Proof-of-concept exploits (1)
- dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md#poc1★ · 2026-10-07
Security advisories
- dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md
- https://vuldb.com/?id.347334
- https://vuldb.com/?submit.755450