CVE-2021-39242
HIGHHAProxy 2.2.0-2.2.15, 2.3.0-2.3.12, 2.4.0-2.4.2 - HTTP Host Header Handling Issue
Title source: llmDescription
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.
References (5)
Core 5
Core References
Mailing List x_refsource_misc
https://www.mail-archive.com/haproxy%40formilux.org/msg41041.html
Various Sources x_refsource_misc
https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2021/dsa-4960
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPNY4WZIQUAUOCLIMUPC37AQWNXTWIQM/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ALECUZDIMT5FYGP6V6PVSI4BKVZTZWN/
Scores
CVSS v3
7.5
EPSS
0.0047
EPSS Percentile
64.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Details
CWE
CWE-755
Status
published
Products (4)
debian/debian_linux
11.0
fedoraproject/fedora
33
fedoraproject/fedora
34
haproxy/haproxy
2.2.0 - 2.2.16
Published
Aug 17, 2021
Tracked Since
Feb 18, 2026