CVE-2022-37797

Exp

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.

Published: 2022-09-12 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]

NVD Status：Modified，CVE State: published

View at NVD, CVE.org, EUVD

Threat Intelligence & Risk Assessment for CVE-2022-37797

EPSS CVSS CWE Exploit-DB Affected OS Tracker

Conclusion & alert: CVE-2022-37797 is rated High Exploit Risk (72.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.91%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2022-37797

EDB-ID	Source	Kind	Published	Link
—	nvd_ref	exploit_tag		Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2022-37797

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.44%	1.91%	+0.47%
2	2026-03-24	0.36%	1.44%	+1.09%
3	2026-01-13	—	0.36%	—

Full EPSS history (23 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2022-37797

CVSS metrics for this CVE.

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]

Weakness enumeration for CVE-2022-37797

CWE-476 MITRE ↗

OS Trackers for CVE-2022-37797

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-37797 not yet assigned priority: Debian including 1 source packages (lighttpd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2022-37797
`gentoo`	low	CVE-2022-37797: 1 GLSA(s) (202210-12), 1 atom(s) (www-servers/lighttpd); latest impact low.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2022-37797
`suse`	high	CVE-2022-37797 severity important: SUSE including 40 source package names (lighttpd, lighttpd-1.4.66-1.1, …), 69 product×package rows across 9 product lines (SUSE Linux Enterprise High Availability Extension 12 SP4, SUSE Linux Enterprise High Availability Extension 12 SP5, … (9 product lines)): Fixed 65, Known Not Affected 4.	https://www.suse.com/security/cve/CVE-2022-37797/
`ubuntu`	medium	CVE-2022-37797 medium priority: Ubuntu including 1 source packages (lighttpd), 13 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 8, ignored 2, needed 2, released 1.	https://ubuntu.com/security/CVE-2022-37797

Affected software / configurations for CVE-2022-37797

Vendor	Product	Version	Raw CPE
lighttpd	lighttpd	1.4.65	cpe:2.3:a:lighttpd:lighttpd:1.4.65:::::::*
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*

References for CVE-2022-37797

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

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