NULL pointer dereference in Lighttpd
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.025 (84.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.025 · change: +0.005
Affected products
- Lighttpd — versions 1.4.65
- Debian Linux — versions 10.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- redmine.lighttpd.net/issues/3165 (Exploit, Third Party Advisory, Issue Tracking)
- www.debian.org/security/2022/dsa-5243 (vendor-advisory, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/10/msg00002.html (mailing-list, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202210-12 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-37797?
- CVE-2022-37797 is a high-severity vulnerability in Lighttpd, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2022-09-12.
- How severe is CVE-2022-37797?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2022-37797 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.