CVE-2021-40346

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-190

Affected software

No affected versions have been published.

Timeline

Published: Sep 8, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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