CVE-2021-39240

medium

Published — · Modified —

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CVSS v3

—

CVSS v4 NEW

—

not yet in upstream

VIR risk

5.5

Description

An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It does not ensure that the scheme and path portions of a URI have the expected characters. For example, the authority field (as observed on a target HTTP/2 server) might differ from what the routing rules were intended to achieve.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`2.4.3-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`2.2.16-1`
sid	Fixed	`2.2.16-1`
forky	Fixed	`2.2.16-1`
bullseye	Fixed	`2.2.9-2+deb11u1`
bookworm	Fixed	`2.2.16-1`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

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