HOMEVULNERABILITIESCVE-2022-37797
HIGH

CVE-2022-37797

CWE-476Published: September 12, 2022· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2022-37797 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
lighttpd1 product(s)
lighttpd
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/10/msg00002.html
ADVISORYhttps://redmine.lighttpd.net/issues/3165
ADVISORYhttps://security.gentoo.org/glsa/202210-12
ADVISORYhttps://www.debian.org/security/2022/dsa-5243
ADVISORYhttps://lists.debian.org/debian-lts-announce/2022/10/msg00002.html
ADVISORYhttps://redmine.lighttpd.net/issues/3165
ADVISORYhttps://security.gentoo.org/glsa/202210-12
ADVISORYhttps://www.debian.org/security/2022/dsa-5243

All References (8)

→
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

Quick Facts

CVE IDCVE-2022-37797
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-476
CISA KEVNo
Affected2 vendor(s)
PublishedSep 12, 2022

Related CVEs (CWE-476)

CVE-2022-36648
10.0
CVE-2010-2495
10.0
CVE-2022-26093
9.8
CVE-2023-47003
9.8
CVE-2023-31129
9.8
CVE-2024-47613
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2022-37797 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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