CVE-2025-12642 describes a critical vulnerability in lighttpd version 1.4.80, where incorrect merging of trailer fields into headers after HTTP request parsing enables HTTP Header Smuggling attacks. This flaw, rated 9.1 CVSS (CRITICAL), allows unauthenticated attackers to bypass access controls, inject malicious input into backend logic, and potentially execute HTTP Request Smuggling. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
1.4.80CPE matchmatch criteria | cpe:2.3:a:lighttpd:lighttpd:1.4.80:*:*:*:*:*:*:* | ||
>= 1.4.80, < 1.4.81CPE match | cpe:2.3:a:lighttpd:lighttpd:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.