CVE-2021-39242
7.5
HIGH
CVSS 3.1
EPSS 0.47%
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 can lead to a situation with an attacker-controlled HTTP Host header, because a mismatch between Host and authority is mishandled.
How to fix CVE-2021-39242
To remediate CVE-2021-39242, upgrade the affected package to a fixed version below.
- Bitnami/haproxy—upgrade to 2.2.16 or later
- Debian/haproxy—upgrade to 2.2.9-2+deb11u1 or later
Is CVE-2021-39242 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 2.2.0, < 2.2.16, >= 2.3.0, < 2.3.13, >= 2.4.0, < 2.4.3
- from 0, < 2.2.9-2+deb11u1
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 |