CVE-2022-22707

Name: CVE-2022-22707
Creator: NVD / NIST
Published: 2022-01-06T06:15:07.243+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 8.97%

Last modified Jun 17, 2026

CVE-2022-22707 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. In lighttpd 1.4.46 through 1.4.63, the mod_extforward_Forwarded function of the mod_extforward plugin has a stack-based buffer overflow (4 bytes representing -1), as demonstrated by remote denial of service (daemon crash) in a non-default configuration. The non-default configuration requires handling of the Forwarded header in a somewhat unusual manner. EPSS estimates a 8.97% chance of exploitation in the next 30 days.

Description

In lighttpd 1.4.46 through 1.4.63, the mod_extforward_Forwarded function of the mod_extforward plugin has a stack-based buffer overflow (4 bytes representing -1), as demonstrated by remote denial of service (daemon crash) in a non-default configuration. The non-default configuration requires handling of the Forwarded header in a somewhat unusual manner. Also, a 32-bit system is much more likely to be affected than a 64-bit system.

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

8.97%

94.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Lighttpd	Lighttpd	>= 1.4.46, <= 1.4.63
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://redmine.lighttpd.net/issues/3134Exploit, Vendor Advisory
https://www.debian.org/security/2022/dsa-5040Third Party Advisory
https://redmine.lighttpd.net/issues/3134Exploit, Vendor Advisory
https://www.debian.org/security/2022/dsa-5040Third Party Advisory

Timeline

Published: Jan 6, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-22707?

How severe is CVE-2022-22707?

CVE-2022-22707 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 8.97% probability of exploitation in the next 30 days.

How do I fix CVE-2022-22707?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-22707?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST