CVE-2021-39242
HIGH7.5EPSS 0.47%Published: 8/17/2021Modified: 4/28/2026
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.
Affected packages (2)
- Bitnami/haproxy>= 2.2.0, < 2.2.16, >= 2.3.0, < 2.3.13, >= 2.4.0, < 2.4.3
- Debian/haproxyfrom 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 |
References (7)
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-39242
- WEBhttps://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=b5d2b9e154d78e4075db163826c5e0f6d31b2ab1
- WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ALECUZDIMT5FYGP6V6PVSI4BKVZTZWN/
- WEBhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPNY4WZIQUAUOCLIMUPC37AQWNXTWIQM/
- WEBhttps://nvd.nist.gov/vuln/detail/CVE-2021-39242
- WEBhttps://www.debian.org/security/2021/dsa-4960
- WEBhttps://www.mail-archive.com/haproxy%40formilux.org/msg41041.html