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 2.71% (84th 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 84th 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

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

2.71%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch1

git.lighttpd.net

Exploit1

github.com

Third-Party Advisory2

Other references1

lists.fedoraproject.org

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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.