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CVE-2021-39242

Published: 17 August 2021

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 can lead to a situation with an attacker-controlled HTTP Host header, because a mismatch between Host and authority is mishandled.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
haproxy
Launchpad, Ubuntu, Debian
impish
Released (2.2.9-2ubuntu1)
upstream Needs triage

trusty Does not exist

bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
hirsute
Released (2.2.9-1ubuntu0.1)
xenial Not vulnerable
(code not present)
jammy
Released (2.2.9-2ubuntu1)
Patches:
upstream: https://git.haproxy.org/?p=haproxy.git;a=commit;h=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1

Severity score breakdown

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