CVE-2021-40346

Summary:

An integer overflow exists in HAProxy 2.0 through 2.5 in htx_add_header that can be exploited to perform an HTTP request smuggling attack, allowing an attacker to bypass all configured http-request HAProxy ACLs and possibly other ACLs.

Reference Links(if available):

https://git.haproxy.org/?p=haproxy.git

https://www.debian.org/security/2021/dsa-4968

https://www.mail-archive.com/[email protected]

https://www.mail-archive.com/[email protected]/msg41114.html

https://jfrog.com/blog/critical-vulnerability-in-haproxy-cve-2021-40346-integer-overflow-enables-http-smuggling/

CVSS Score (if available)

v2: / MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N

v3: / HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Links to Exploits(if available)