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CVE Vulnerability Details :
CVE-2026-2967
PUBLISHED
More InfoOfficial Page
Assigner-VulDB
Assigner Org ID-1af790b2-7ee1-4545-860a-a788eba489b5
View Known Exploited Vulnerability (KEV) details
Published At-23 Feb, 2026 | 02:32
Updated At-23 Feb, 2026 | 13:32
Rejected At-
▼CVE Numbering Authority (CNA)
Cesanta Mongoose TCP Sequence Number net_builtin.c getpeer verification of source

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 Products
Vendor
Cesanta
Product
Mongoose
CPEs
  • cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*
Modules
  • TCP Sequence Number Handler
Versions
Affected
  • 7.0
  • 7.1
  • 7.2
  • 7.3
  • 7.4
  • 7.5
  • 7.6
  • 7.7
  • 7.8
  • 7.9
  • 7.10
  • 7.11
  • 7.12
  • 7.13
  • 7.14
  • 7.15
  • 7.16
  • 7.17
  • 7.18
  • 7.19
  • 7.20
Problem Types
TypeCWE IDDescription
CWECWE-940Improper Verification of Source of a Communication Channel
Type: CWE
CWE ID: CWE-940
Description: Improper Verification of Source of a Communication Channel
Metrics
VersionBase scoreBase severityVector
4.06.3MEDIUM
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
3.13.7LOW
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
3.03.7LOW
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
2.02.6N/A
AV:N/AC:H/Au:N/C:N/I:N/A:P/E:POC/RL:ND/RC:UR
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
Vector:
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
Version: 3.1
Base score: 3.7
Base severity: LOW
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
Version: 3.0
Base score: 3.7
Base severity: LOW
Vector:
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
Version: 2.0
Base score: 2.6
Base severity: N/A
Vector:
AV:N/AC:H/Au:N/C:N/I:N/A:P/E:POC/RL:ND/RC:UR
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
reporter
dwbruijn (VulDB User)
Timeline
EventDate
Advisory disclosed2026-02-22 00:00:00
VulDB entry created2026-02-22 01:00:00
VulDB entry last update2026-02-22 09:02:38
Event: Advisory disclosed
Date: 2026-02-22 00:00:00
Event: VulDB entry created
Date: 2026-02-22 01:00:00
Event: VulDB entry last update
Date: 2026-02-22 09:02:38
Replaced By
Rejected Reason
References
HyperlinkResource
https://vuldb.com/?id.347334
vdb-entry
technical-description
https://vuldb.com/?ctiid.347334
signature
permissions-required
https://vuldb.com/?submit.755450
third-party-advisory
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md
related
https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md#poc
exploit
Hyperlink: https://vuldb.com/?id.347334
Resource:
vdb-entry
technical-description
Hyperlink: https://vuldb.com/?ctiid.347334
Resource:
signature
permissions-required
Hyperlink: https://vuldb.com/?submit.755450
Resource:
third-party-advisory
Hyperlink: https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md
Resource:
related
Hyperlink: https://github.com/dwBruijn/CVEs/blob/main/Mongoose/tcp_rst.md#poc
Resource:
exploit
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found