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Vulnerability record · CVE-2022-0711 · published 2 March 2022

CVE-2022-0711: Haproxy vulnerability

Haproxy · Haproxy

A flaw was found in the way HAProxy processed HTTP responses containing the "Set-Cookie2" header. This flaw could allow an attacker to send crafted HTTP response packets which lead to an infinite loop, eventually resulting in a denial of service condition. The highest threat from this vulnerability is availability.

7.5 CVSS 3.1 High EPSS 17% · top 3.1% CWE-835 · CWE-835
7.5CVSS 3.1 base score, v2 5.0
17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

A flaw was found in the way HAProxy processed HTTP responses containing the "Set-Cookie2" header. This flaw could allow an attacker to send crafted HTTP response packets which lead to an infinite loop, eventually resulting in a denial of service condition. The highest threat from this vulnerability is availability.

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

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/cve-2022-0711 Third Party Advisory
https://github.com/haproxy/haproxy/commit/bfb15ab34ead85f64cd6da0e9fb418c9cd14cee8 PatchThird Party Advisory
https://www.debian.org/security/2022/dsa-5102 Third Party Advisory
https://www.mail-archive.com/haproxy%40formilux.org/msg41833.html
https://access.redhat.com/security/cve/cve-2022-0711 Third Party Advisory
https://github.com/haproxy/haproxy/commit/bfb15ab34ead85f64cd6da0e9fb418c9cd14cee8 PatchThird Party Advisory
https://www.debian.org/security/2022/dsa-5102 Third Party Advisory
https://www.mail-archive.com/haproxy%40formilux.org/msg41833.html

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Source: NIST National Vulnerability Database (record CVE-2022-0711), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.