Vulnerability in Apache Tomcat
CVE-2022-42252
If Apache Tomcat 8.5.0 to 8.5.82, 9.0.0-M1 to 9.0.67, 10.0.0-M1 to 10.0.26 or 10.1.0-M1 to 10.1.0 was configured to ignore invalid HTTP headers via setting rejectIllegalHeader to false (the default for 8.5.x only), Tomcat did not reject a request containing an invalid Content-Length header making a request smuggling attack possible if Tomcat was located behind a reverse proxy that also failed to reject the request with the invalid header.
Vulnerability class: HTTP Request Smuggling
EPSS: 0.014 (70.6th percentile) — read the EPSS interpretation.
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:H/A:N.
Affected products
- Apache Tomcat
- Apache Software Foundation Tomcat — versions 10.1.0-M1, 10.0.0-M1, 9.0.0-M1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (Mailing List, Vendor Advisory)
- security@apache.org
Frequently asked questions
- What is CVE-2022-42252?
- CVE-2022-42252 is a high-severity vulnerability in Apache Tomcat, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 7.5/10. Published 2022-11-01.
- How severe is CVE-2022-42252?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2022-42252 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.