CVE-2017-2891

critical

Published 2017-11-07 · Modified 2026-05-13

CVSS v3

9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2

7.5

VIR risk

9.8

Description

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.

Predictions

Exploit likelihood

97%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2017-2891

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`18.5.0~ds1-1`
debian	bullseye	fixed	`18.5.0~ds1-1`
debian	forky	fixed	`18.5.0~ds1-1`
debian	sid	fixed	`18.5.0~ds1-1`
debian	trixie	fixed	`18.5.0~ds1-1`

Application impact

Vendor	Product	Versions	Fixed
cesanta	mongoose	`6.8`

References

CWEs

CWE-416

Verify integrity in audit chain (admin only). AS-IS.