Vulnerability Database

300,830

Total vulnerabilities in the database

CVE-2025-12642

lighttpd1.4.80 incorrectly merged trailer fields into headers after http request parsing. This behavior can be exploited to conduct HTTP Header Smuggling attacks.

Successful exploitation may allow an attacker to:

  • Bypass access control rules
  • Inject unsafe input into backend logic that trusts request headers
  • Execute HTTP Request Smuggling attacks under some conditions

This issue affects lighttpd1.4.80

  • Published: Nov 3, 2025
  • Updated: Nov 13, 2025
  • CVE: CVE-2025-12642
  • Severity: Critical
  • Exploit:

CVSS v3:

  • Severity: Critical
  • Score: 9.1
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWEs:

Software From Fixed in
lighttpd / lighttpd 1.4.80 1.4.80.x