Skip to main content

Boteraser | Website and Server Security Solutions

🛡️ CVE-2022-41556 — fedora

🟠 CVSS 7.5 — High ⚠️ Exploit Public CWE-401 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2022-41556 is classified as CWE-401: Memory Leak. Allocated memory is never released, so long-running or repeated operations gradually exhaust it.

Affected software

CVE-2022-41556 is recorded against 2 packages.

  • fedora
  • lighttpd (from 1.4.56 up to 1.4.67)

Timeline and source

Published on 6 October 2022 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.lighttpd.net
github.com
github.com
lists.fedoraproject.org
security.gentoo.org
git.lighttpd.net
github.com
github.com
lists.fedoraproject.org
security.gentoo.org

Other advisories for this package

fedora has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-401: Memory Leak) in other software:

CVE-2022-41556 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-401
Public Exploit ⚠️ Yes
Source NVD
Published 2022-10-06
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
fedora — —
lighttpd 1.4.56 1.4.67

References

Exploit, Issue Tracking, Third Party Advisory https://github.com/lighttpd/lighttpd1.4/pull/115
Exploit, Issue Tracking, Third Party Advisory https://github.com/lighttpd/lighttpd1.4/pull/115

Similar Threats

Exploit Protection

Are you running fedora?

CVE-2022-41556 carries CVSS 7.5 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

Check My Site For CVE-2022-41556 →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

Browse related advisories

All advisoriesCVECVE 2022
✓