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Vulnerability record · CVE-2023-45648 · published 10 October 2023

CVE-2023-45648: Apache tomcat improper input validation vulnerability

Apache · Tomcat

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.

5.3 CVSS 3.1 Medium EPSS 5.8% · top 7.1% CWE-20 · Improper input validation
5.3CVSS 3.1 base score
5.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp Vendor Advisory
http://www.openwall.com/lists/oss-security/2023/10/10/10 Mailing ListThird Party Advisory
https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20231103-0007/
https://www.debian.org/security/2023/dsa-5521 Third Party Advisory
https://www.debian.org/security/2023/dsa-5522 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-45648), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.