CVE-2026-2967A security vulnerability has been detected in Cesanta Mongoose up to 7.20.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 3.7 LOW (v3.1, NVD)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-940
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
cesanta mongoose cesanta:mongoose | through 7.20 | NVD |
References
- https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.mdexploit, third-party-advisory
- https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md#pocexploit, third-party-advisory
- https://vuldb.com/?ctiid.347334permissions-required, vdb-entry
- https://vuldb.com/?id.347334third-party-advisory, vdb-entry
- https://vuldb.com/?submit.755450third-party-advisory, vdb-entry
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.