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No exploitation reportedFix available

CVE-2022-41556

No exploitation reported by the sources we read.

  • Published2022-10-06
  • Fixed in1.4.67
  • WeaknessCWE-401

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-10-0618:17CVE publishedNVD

Versions per branch

NVD
lighttpd
BranchAffectedFixed in
1.4≥ 1.4.56, < 1.4.671.4.67
Fedoraproject fedora
BranchAffectedFixed in
35.x= 35no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • lighttpdUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • lighttpdUbuntu:22.04:LTSall versions · fixed in 1.4.63-1ubuntu3.1
  • lighttpdUbuntu:20.04:LTSall versions · fixed in 1.4.55-1ubuntu1.20.04.2
  • lighttpdSUSE:Package Hub 15 SP4all versions · fixed in 1.4.67-bp154.2.6.1
  • lighttpdSUSE:Package Hub 15 SP3all versions · fixed in 1.4.67-bp154.2.6.1
  • lighttpdopenSUSE:Tumbleweedall versions · fixed in 1.4.67-2.1
  • lighttpdopenSUSE:Leap 15.4all versions · fixed in 1.4.67-bp154.2.6.1
  • lighttpdopenSUSE:Leap 15.3all versions · fixed in 1.4.67-bp154.2.6.1

19 more package ranges on OSV.dev

Vendor advisories

  • CVE-2022-41556 Red Hat Product Security

    lighttpd: resource leak can lead to denial of service

  • ICSA-24-046-11 CISA11 known affected

    Siemens SCALANCE XCM-/XRM-300

    SCALANCE XCH328 (6GK5328-4TS01-2EC2) · SCALANCE XCM324 (6GK5324-8TS01-2AC2) · SCALANCE XCM328 (6GK5328-4TS01-2AC2) · +8 more

  • SSA-806742 Siemens ProductCERT11 known affected

    SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.4

    SCALANCE XCH328 (6GK5328-4TS01-2EC2) · SCALANCE XCM324 (6GK5324-8TS01-2AC2) · SCALANCE XCM328 (6GK5328-4TS01-2AC2) · +8 more

Full record on NVD

Fix

  1. Update lighttpd to 1.4.67
  2. Vendor fix Siemens ProductCERT SSA-806742 · 10 productsUpdate to V2.4 or later version
  3. Vendor fix CISA ICSA-24-046-11 · 10 productsUpdate to V2.4 or later version

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-10-06
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-jm88-vr5q-23rj

Frequently asked questions

What is CVE-2022-41556?

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.

Is CVE-2022-41556 actively exploited?

Active exploitation of CVE-2022-41556 has not been confirmed. Its EPSS score was 3.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

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

CVE-2022-41556 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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