CVE-2022-41556

HIGH

lighttpd 1.4.56-1.4.66 - Denial of Service via RDHUP Mishandling in HTTP/1.1 Chunked Requests

Title source: llm

Description

A resource leak in gw_backend.c in lighttpd 1.4.56 through 1.4.66 could lead to a denial of service (connection-slot exhaustion) after a large amount of anomalous TCP behavior by clients. It is related to RDHUP mishandling in certain HTTP/1.1 chunked situations. Use of mod_fastcgi is, for example, affected. This is fixed in 1.4.67.

References (5)

Core 5

Core References

Patch, Third Party Advisory

https://git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343548e50

Third Party Advisory

https://github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.67

Exploit, Issue Tracking, Third Party Advisory

https://github.com/lighttpd/lighttpd1.4/pull/115

Mailing List, Third Party Advisory vendor-advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OVOSBSCMLGCHH2Z74H64ZWVDFJFQTBC2/

Third Party Advisory vendor-advisory

https://security.gentoo.org/glsa/202210-12

Scores

CVSS v3 7.5

EPSS 0.0181

EPSS Percentile 83.1%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-401

Status published

Products (2)

fedoraproject/fedora 35

lighttpd/lighttpd 1.4.56 - 1.4.67

Published Oct 06, 2022

Tracked Since Feb 18, 2026