CVE-2023-45648
Apache Tomcat: Trailer header parsing too lenient
MEDIUM 5.3EPSS 5.9%
Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy.Older, EOL versions may also be affected.Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.
- Affected
- Apache Software Foundation · Apache Tomcat
- CVSS v3.1 NVD
- 5.3 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - EPSS
- 5.88% chance of exploitation in the next 30 days, 93rd percentile
- Nuclei
- medium · CWE-444
- Published
- 2023-10-10
- Updated
- 2025-10-29
Proof-of-concept exploits (1)
- ckiellandpanw/brokenbank0★ · 2026-10-05
Nuclei templates (1)
Security advisories
- https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp
- http://www.openwall.com/lists/oss-security/2023/10/10/10
- https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html
- https://www.debian.org/security/2023/dsa-5521
- https://www.debian.org/security/2023/dsa-5522
- advisories/GHSA-r6j3-px5g-cq3x