Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop
Published Apr 25, 2026
6.9
MEDIUMCVSS 4.0
EPSS 0.92%
Description
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.
Affected products
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- Version 7.0StatusaffectedConstraints-
- Version 7.1StatusaffectedConstraints-
- Version 7.10StatusaffectedConstraints-
- Version 7.11StatusaffectedConstraints-
- Version 7.12StatusaffectedConstraints-
- Version 7.13StatusaffectedConstraints-
- Version 7.14StatusaffectedConstraints-
- Version 7.15StatusaffectedConstraints-
- Version 7.16StatusaffectedConstraints-
- Version 7.17StatusaffectedConstraints-
- Version 7.18StatusaffectedConstraints-
- Version 7.19StatusaffectedConstraints-
- Version 7.2StatusaffectedConstraints-
- Version 7.20StatusaffectedConstraints-
- Version 7.3StatusaffectedConstraints-
- Version 7.4StatusaffectedConstraints-
- Version 7.5StatusaffectedConstraints-
- Version 7.6StatusaffectedConstraints-
- Version 7.7StatusaffectedConstraints-
- Version 7.8StatusaffectedConstraints-
- Version 7.9StatusaffectedConstraints-
- Version 7.21StatusunaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cesanta | Mongoose | n/a |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (5)
- https://github.com/cesanta/mongoose/releases/tag/7.21 patchProductRelease Notes
- https://github.com/dwBruijn/CVEs/blob/main/Mongoose/TCP_opt_dos.md exploitThird Party Advisory
- https://vuldb.com/submit/796230 third-party-advisoryThird Party AdvisoryVDB Entry
- https://vuldb.com/vuln/359528 vdb-entrytechnical-descriptionThird Party AdvisoryVDB Entry
- https://vuldb.com/vuln/359528/cti signaturepermissions-requiredPermissions RequiredVDB Entry
| Link | Providers | Tags |
|---|---|---|
| https://github.com/cesanta/mongoose/releases/tag/7.21 | patchProductRelease Notes | |
| https://github.com/dwBruijn/CVEs/blob/main/Mongoose/TCP_opt_dos.md | exploitThird Party Advisory | |
| https://vuldb.com/submit/796230 | third-party-advisoryThird Party AdvisoryVDB Entry | |
| https://vuldb.com/vuln/359528 | vdb-entrytechnical-descriptionThird Party AdvisoryVDB Entry | |
| https://vuldb.com/vuln/359528/cti | signaturepermissions-requiredPermissions RequiredVDB Entry |
Change history (0)
No recorded changes yet.