CVE-2021-40540

medium

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

5.5

Description

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.

Predictions

Exploit likelihood

20%

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-2021-40540

OS impact

OS	Version	Status	Fixed in
arch		fixed	`2.7.4-1`
debian	bookworm	fixed	`2.7.1-2`
debian	bullseye	fixed	`2.7.1-1+deb11u1`
debian	forky	fixed	`2.7.1-2`
debian	sid	fixed	`2.7.1-2`
debian	trixie	fixed	`2.7.1-2`

References

https://security-tracker.debian.org/tracker/CVE-2021-40540

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