Cyber Resilience

CVE-2022-41556

HighPublic PoC

Published: 06 October 2022

Published
06 October 2022
Modified
21 November 2024
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0181 83.2th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2022-41556 is a high-severity Missing Release of Memory after Effective Lifetime (CWE-401) vulnerability in Lighttpd Lighttpd. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 16.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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.…

more

Use of mod_fastcgi is, for example, affected. This is fixed in 1.4.67.

CWE(s)
CWE-401

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

lighttpd
lighttpd
1.4.56 — 1.4.67
fedoraproject
fedora
35

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References