CVE-2022-37797

Name: CVE-2022-37797
Creator: NVD / NIST
Published: 2022-09-12T15:15:08.17+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.98%

Last modified Jun 17, 2026

CVE-2022-37797 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In lighttpd 1.4.65, mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (websocket handshake) is received. It leads to null pointer dereference which crashes the server. EPSS estimates a 1.98% chance of exploitation in the next 30 days.

Description

In lighttpd 1.4.65, mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (websocket handshake) is received. It leads to null pointer dereference which crashes the server. It could be used by an external attacker to cause denial of service condition.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.98%

78.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Lighttpd	Lighttpd	1.4.65
Debian	Debian Linux	10.0

References

https://lists.debian.org/debian-lts-announce/2022/10/msg00002.htmlMailing List, Third Party Advisory
https://redmine.lighttpd.net/issues/3165Exploit, Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202210-12Third Party Advisory
https://www.debian.org/security/2022/dsa-5243Mailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00002.htmlMailing List, Third Party Advisory
https://redmine.lighttpd.net/issues/3165Exploit, Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202210-12Third Party Advisory
https://www.debian.org/security/2022/dsa-5243Mailing List, Third Party Advisory

Timeline

Published: Sep 12, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-37797?

How severe is CVE-2022-37797?

CVE-2022-37797 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.98% probability of exploitation in the next 30 days.

How do I fix CVE-2022-37797?

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-2022-37797?

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

Scan your code now

Source: NVD / NIST