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Description

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 Reserved 2026-02-22 | Published 2026-02-23 | Updated 2026-02-23 | Assigner VulDB




MEDIUM: 6.3CVSS: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
LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
LOW: 3.7CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
2.6AV:N/AC:H/Au:N/C:N/I:N/A:P/E:POC/RL:ND/RC:UR

Problem types

Improper Verification of Source of a Communication Channel

Product status

7.0
affected

7.1
affected

7.2
affected

7.3
affected

7.4
affected

7.5
affected

7.6
affected

7.7
affected

7.8
affected

7.9
affected

7.10
affected

7.11
affected

7.12
affected

7.13
affected

7.14
affected

7.15
affected

7.16
affected

7.17
affected

7.18
affected

7.19
affected

7.20
affected

Timeline

2026-02-22:Advisory disclosed
2026-02-22:VulDB entry created
2026-02-22:VulDB entry last update

Credits

dwbruijn (VulDB User) reporter

References

vuldb.com/?id.347334 (VDB-347334 | Cesanta Mongoose TCP Sequence Number net_builtin.c getpeer verification of source) vdb-entry technical-description

vuldb.com/?ctiid.347334 (VDB-347334 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/?submit.755450 (Submit #755450 | Cesanta Mongoose Embedded Web Server 7.20 Improper Validation of Specified Index, Position, or Offset in I) third-party-advisory

github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md related

github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md exploit

cve.org (CVE-2026-2967)

nvd.nist.gov (CVE-2026-2967)

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