CVE-2022-41556

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.45%
Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://git.lighttpd.net/lighttpd/lighttpd1.4/commit/b18de6f9264f914f7bf493abd3b6059343548e50 third party advisory patch
https://github.com/lighttpd/lighttpd1.4/pull/115 issue tracking exploit third party advisory
https://github.com/lighttpd/lighttpd1.4/compare/lighttpd-1.4.66...lighttpd-1.4.67 third party advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OVOSBSCMLGCHH2Z74H64ZWVDFJFQTBC2/ vendor advisory
https://security.gentoo.org/glsa/202210-12 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2022-41556?
CVE-2022-41556 has been scored as a high severity vulnerability.
How to fix CVE-2022-41556?
To fix CVE-2022-41556, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-41556 being actively exploited in the wild?
It is possible that CVE-2022-41556 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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