CVE-2021-39242
Last modified
CVE-2021-39242 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.32% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haproxy | Haproxy | >= 2.2.0, < 2.2.16 |
| Haproxy | Haproxy | >= 2.3.0, < 2.3.13 |
| Haproxy | Haproxy | >= 2.4.0, < 2.4.3 |
| Debian | Debian Linux | 11.0 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
References
- https://www.debian.org/security/2021/dsa-4960Third Party Advisory
- https://www.debian.org/security/2021/dsa-4960Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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