Is CVE-2022-41556 in the CISA KEV catalog?

No. CVE-2022-41556 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-41556?

CVE-2022-41556 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2022-41556?

CVE-2022-41556 has an EPSS score of 2.79% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-41556?

Upgrade lighttpd on debian 11 to 1.4.59-1+deb11u2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2022-41556

HIGHEPSS 85th pctl

7.5

CVSS v3

NVD

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.

CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

lighttpdDebian

Fixed in:1.4.59-1+deb11u2CVE-2022-41556

Fixed in:1.4.67-1CVE-2022-41556

lighttpdUbuntu

Fixed in:1.4.55-1ubuntu1.20.04.2USN-5903-1

Fixed in:1.4.63-1ubuntu3.1USN-5903-1

Fixed in:1.4.65-2ubuntu1.1USN-5903-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

2.79%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Patch1

git.lighttpd.net

Exploit1

github.com

Third-Party Advisory2

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-401 (Missing Release of Memory (Memory Leak)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13934	High	7.5	64%	-	Fix
CVE-2016-6304	High	7.5	63%	-	Fix
CVE-2019-12265	Medium	5.3	55%	-	Fix
CVE-2001-0136	Medium	5.0	45%	-	-
CVE-2016-4232	High	7.5	36%	-	-
CVE-2001-0543	Medium	5.0	19%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.