CVE-2021-40346
haproxy - security update
7.5
HIGH
CVSS 3.1
EPSS 92.4%
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.
How to fix CVE-2021-40346
To remediate CVE-2021-40346, upgrade the affected package to a fixed version below.
- Bitnami/haproxy—upgrade to 2.0.25 or later
- —upgrade to 2.2.9-2+deb11u2 or later
- —upgrade to 2.2.9-2+deb11u2 or later
Is CVE-2021-40346 being exploited?
Likely — EPSS is 92.4%, placing CVE-2021-40346 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (3)
- >= 2.0.0, < 2.0.25, >= 2.2.0, < 2.2.17, >= 2.3.0, < 2.3.14, >= 2.4.0, < 2.4.4
- from 0, < 2.2.9-2+deb11u2
- from 0, < 2.2.9-2+deb11u2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |