CVE-2021-39240

HIGH

HAProxy 2.2-2.2.15, 2.3-2.3.12, 2.4-2.4.2 - HTTP Request Smuggling via URI Scheme and Path Mismatch

Title source: llm

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.

References (6)

Core 6

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=a495e0d94876c9d39763db319f609351907a31e8

Various Sources x_refsource_misc

https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=4b8852c70d8c4b7e225e24eb58258a15eb54c26e

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 0.0007

EPSS Percentile 20.5%

Attack Vector NETWORK

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

Details

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