VULNERABILITY INTELLIGENCE
CVE-2021-39242
CVSS score7.5 HIGH
EPSS probability2.23%
CISA KEVNot currently listed
Published2021-08-17
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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.
Weakness classification
- CWE-755: Improper Handling of Exceptional Conditions