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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 1
- First seenCVSS 5.5 · cesantaNVD modified 2026-10-26 22:10
Affected (CPE criteria) 1
cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:*
References 5
- https://github.com/cesanta/mongoose/releases/tag/7.21 Product, Release Notes
- https://github.com/dwBruijn/CVEs/blob/main/Mongoose/TCP_opt_dos.md Exploit, Third Party Advisory
- https://vuldb.com/submit/796230 Third Party Advisory, VDB Entry
- https://vuldb.com/vuln/359528 Third Party Advisory, VDB Entry
- https://vuldb.com/vuln/359528/cti Permissions Required, VDB Entry