UpHeron
All vulnerabilities

Servers and applications

CVE-2021-39242

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.

Severity
High 7.5
Published
17 Aug 2021
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
2.2.16, 2.3.13, 2.4.3
Sources
NVD

Affected software

SoftwareAffected versions
HAProxyServers and applications · cpe:a:haproxy:haproxy
  • From 2.2.0 before 2.2.16
  • From 2.3.0 before 2.3.13
  • From 2.4.0 before 2.4.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-39242
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-39242