Input validation error in HAProxy - CVE-2021-39242
Published: August 18, 2021
Vulnerability identifier: #VU55971
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-39242
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
HAProxy
HAProxy
Software vendor:
HAProxy
HAProxy
Description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of user-supplied input when processing HTTP headers. A remote attacker can send a specially crafted Host header to the application and bypass implemented security restrictions.
Remediation
Install updates from vendor's website.