CVE-2024-45506

Publication date 4 September 2024

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

HAProxy 2.9.x before 2.9.10, 3.0.x before 3.0.4, and 3.1.x through 3.1-dev6 allows a remote denial of service for HTTP/2 zero-copy forwarding (h2_send loop) under a certain set of conditions, as exploited in the wild in 2024.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
haproxy	24.04 LTS noble	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected

Notes

mdeslaur

only exploitable in 2.9+ commits list below for 3.x is incomplete, a second commit is required. See comment in main commit.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
haproxy	Upstream: http://git.haproxy.org/?p=haproxy-2.9.git;a=commit;h=ffdb7f40c84215d94bc0d68f51f6d832eea7b6c7 Upstream: http://git.haproxy.org/?p=haproxy-2.9.git;a=commit;h=c6bc43e9ac18f122f9dee22df47ab1b7ef57b429 Upstream: http://git.haproxy.org/?p=haproxy-3.0.git;a=commit;h=c725db17e8416ffb3c1537aea756356228ce5e3c

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H