CVE-2017-2891: Cesanta Mongoose

Critical severity, CVSS 9.8. EPSS: 2.8% chance of exploitation in the next 30 days.

An exploitable use-after-free vulnerability exists in the HTTP server implementation of Cesanta Mongoose 6.8. An ordinary HTTP POST request with a CGI target can cause a reuse of previously freed pointer potentially resulting in remote code execution. An attacker needs to send this HTTP request over the network to trigger this vulnerability.

Affected products

• Cesanta Mongoose: version 6.8 only

Published 2017-11-07. Last modified 2026-06-17.