Vulnerability in Lighttpd
CVE-2022-41556
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.029 (86.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: +0.000
Affected products
- Lighttpd
- Fedoraproject Fedora — versions 35
Weakness classification (CWE)
Public proof-of-concept exploits
References
- git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343… (Patch, Third Party Advisory)
- github.com/lighttpd/lighttpd1.4/pull/115 (Exploit, Third Party Advisory, Issue Tracking)
- github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.67 (Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202210-12 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-41556?
- CVE-2022-41556 is a high-severity vulnerability in Lighttpd, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2022-10-06.
- How severe is CVE-2022-41556?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2022-41556 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.