CVE-2023-45648

Name: CVE-2023-45648
Creator: NVD / NIST
Published: 2023-10-10T19:15:09.69+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 5.85%

Last modified Jun 17, 2026

CVE-2023-45648 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 5.85% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

5.85%

92.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions	Update
Apache	Tomcat	>= 8.5.0, < 8.5.94	—
Apache	Tomcat	>= 9.0.1, < 9.0.81	—
Apache	Tomcat	>= 10.1.1, < 10.1.14	—
Apache	Tomcat	9.0.0	Milestone1
Apache	Tomcat	10.1.0	Milestone1
Apache	Tomcat	11.0.0	Milestone1
Debian	Debian Linux	10.0	—
Debian	Debian Linux	11.0	—
Debian	Debian Linux	12.0	—

References

https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdpVendor Advisory
http://www.openwall.com/lists/oss-security/2023/10/10/10Mailing List, Third Party Advisory
https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdpVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00020.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20231103-0007/
https://www.debian.org/security/2023/dsa-5521Third Party Advisory
https://www.debian.org/security/2023/dsa-5522Third Party Advisory

Timeline

Published: Oct 10, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-45648?

How severe is CVE-2023-45648?

CVE-2023-45648 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 5.85% probability of exploitation in the next 30 days.

How do I fix CVE-2023-45648?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-45648?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST