Description

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.

Related CPE's

a

haproxy

haproxy

11

o

debian

debian_linux

11.0

Vulnerable

o

fedoraproject

fedora

2

References

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

PatchVendor Advisory

https://github.com/haproxy/haproxy/commit/3b69886f7dcc3cfb3d166309018e6cfec9ce2c95

PatchThird Party Advisory

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

ExploitMitigationThird Party Advisory

https://lists.apache.org/thread.html/r284567dd7523f5823e2ce995f787ccd37b1cc4108779c50a97c79120%40%3Cdev.cloudstack.apache.org%3E

https://lists.apache.org/thread.html/r8a58fd7a29808e5d27ee56877745e58dc4bb041b9af94601554e2a5a%40%3Cdev.cloudstack.apache.org%3E

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A7V2IYO22LWVBGUNZWVKNTMDV4KINLFO/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXTSBY2TEAXWZVFQM3CXHJFRONX7PEMN/

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

Third Party Advisory

https://www.mail-archive.com/haproxy%40formilux.org

https://www.mail-archive.com/haproxy%40formilux.org/msg41114.html

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

PatchVendor Advisory

https://github.com/haproxy/haproxy/commit/3b69886f7dcc3cfb3d166309018e6cfec9ce2c95

PatchThird Party Advisory

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

ExploitMitigationThird Party Advisory

https://lists.apache.org/thread.html/r284567dd7523f5823e2ce995f787ccd37b1cc4108779c50a97c79120%40%3Cdev.cloudstack.apache.org%3E

https://lists.apache.org/thread.html/r8a58fd7a29808e5d27ee56877745e58dc4bb041b9af94601554e2a5a%40%3Cdev.cloudstack.apache.org%3E

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A7V2IYO22LWVBGUNZWVKNTMDV4KINLFO/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MXTSBY2TEAXWZVFQM3CXHJFRONX7PEMN/

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

Third Party Advisory

https://www.mail-archive.com/haproxy%40formilux.org

https://www.mail-archive.com/haproxy%40formilux.org/msg41114.html

Weaknesses

[email protected]

Primary
CWE-190

CVSS impact metrics

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

7.5 · High

Information

Source identifier

[email protected]

Vulnerability status

Modified

Published

2021-09-08T17:15:12.457Z

5 years ago

Last modified

2026-06-17T04:06:46.193Z

3 months ago