CVE-2022-37797
CVSS v3
7.5
HIGH
EPSS Score
2.5 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2022-09-12
Frequently asked questions
What is CVE-2022-37797?
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.
Is CVE-2022-37797 actively exploited?
Active exploitation of CVE-2022-37797 has not been confirmed. Its EPSS score was 2.5% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2022-37797?
CVE-2022-37797 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2022-37797 affecting your environment?
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