CVE-2026-6985
MEDIUMCesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop
Title source: cnaDescription
A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_opt of the file /src/net_builtin.c of the component TCP Option Handler. This manipulation of the argument optlen causes infinite loop. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.21 is able to resolve this issue. Upgrading the affected component is advised. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.
References (5)
Core 5
Core References
Vdb Entry, Technical Description vdb-entry
technical-description
VDB-359528 | Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop
https://vuldb.com/vuln/359528
Signature, Permissions Required signature
permissions-required
VDB-359528 | CTI Indicators (IOB, IOC, TTP, IOA)
https://vuldb.com/vuln/359528/cti
Third Party Advisory third-party-advisory
Submit #796230 | Cesanta Mongoose 7.20 Denial of Service
https://vuldb.com/submit/796230
Scores
CVSS v3
5.3
EPSS
0.0056
EPSS Percentile
42.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-404
CWE-835
Status
published
Products (23)
Cesanta/Mongoose
7.0
cesanta/mongoose
7.0 - 7.21
Cesanta/Mongoose
7.1
Cesanta/Mongoose
7.10
Cesanta/Mongoose
7.11
Cesanta/Mongoose
7.12
Cesanta/Mongoose
7.13
Cesanta/Mongoose
7.14
Cesanta/Mongoose
7.15
Cesanta/Mongoose
7.16
... and 13 more
Published
Apr 25, 2026
Tracked Since
Apr 25, 2026