Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Lighttpd | Lighttpd | >= 1.4.56, < 1.4.67 |
| Fedoraproject | Fedora | 35 |
Related Weaknesses (CWE)
References
- https://git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3bPatchThird Party Advisory
- https://github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.6Third Party Advisory
- https://github.com/lighttpd/lighttpd1.4/pull/115ExploitIssue TrackingThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202210-12Third Party Advisory
- https://git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3bPatchThird Party Advisory
- https://github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.6Third Party Advisory
- https://github.com/lighttpd/lighttpd1.4/pull/115ExploitIssue TrackingThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202210-12Third Party Advisory
FAQ
What is CVE-2022-41556?
CVE-2022-41556 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 relate...
How severe is CVE-2022-41556?
CVE-2022-41556 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-41556?
Check the references section above for vendor advisories and patch information. Affected products include: Lighttpd Lighttpd, Fedoraproject Fedora.