vulnerability
Apache Tomcat: Important: Request smuggling (CVE-2023-45648)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:N/AC:L/Au:N/C:N/I:P/A:N) | Oct 10, 2023 | Oct 11, 2023 | Jun 19, 2026 |
Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
Published
Oct 10, 2023
Added
Oct 11, 2023
Modified
Jun 19, 2026
Description
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.
Solutions
apache-tomcat-upgrade-8_5_94apache-tomcat-upgrade-9_0_81apache-tomcat-upgrade-10_1_14apache-tomcat-upgrade-11_0_0apache-tomcat-10_1apache-tomcat-11_0apache-tomcat-8_5apache-tomcat-9_0apache-tomcat-upgrade-latest
References
- CVE-2023-45648
- https://attackerkb.com/topics/CVE-2023-45648
- https://tomcat.apache.org/security-10.html
- https://tomcat.apache.org/security-11.html
- https://tomcat.apache.org/security-8.html
- https://tomcat.apache.org/security-9.html
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-2799
- CWE-20
- EUVD-EUVD-2023-2799
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.