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CVE-2025-12642— HTTP Header Smuggling via Trailer Merge

Quick assessment

Affected
lighttpd lighttpd
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

lighttpd是德国Jan Kneschke个人开发者的一款开源的Web服务器。 lighttpd 1.4.80版本存在安全漏洞，该漏洞源于错误地将尾部字段合并到标头中，可能导致HTTP标头走私攻击、绕过访问控制规则和注入不安全输入。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.34% · P28

Possible ATT&CK Techniques 1 AI

T1102 · Web Service
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I. Basic Information for CVE-2025-12642

Vulnerability Information
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Vulnerability Title
HTTP Header Smuggling via Trailer Merge
Source: CVE Program / CVE List V5
Vulnerability Description
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
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
lighttpd 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lighttpd是德国Jan Kneschke个人开发者的一款开源的Web服务器。 lighttpd 1.4.80版本存在安全漏洞，该漏洞源于错误地将尾部字段合并到标头中，可能导致HTTP标头走私攻击、绕过访问控制规则和注入不安全输入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
lighttpd lighttpd 1.4.80 ~ 1.4.81 -

II. Public POCs for CVE-2025-12642

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III. Intelligence Information for CVE-2025-12642

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IV. Related Vulnerabilities

Same product: lighttpd
Same vendor: lighttpd
Same weakness: CWE-444

V. Comments for CVE-2025-12642

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