Description
Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit 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-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.
References (4)
Scores
CVSS v3
7.5
EPSS
0.5789
EPSS Percentile
98.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-444
Status
published
Products (4)
apache/tomcat
11.0.0 milestone1 (10 CPE variants)
apache/tomcat
8.5.0 - 8.5.96
org.apache.tomcat/tomcat-catalina
11.0.0-M1 - 11.0.0-M11Maven
org.apache.tomcat.embed/tomcat-embed-core
11.0.0-M1 - 11.0.0-M11Maven
Published
Nov 28, 2023
Tracked Since
Feb 18, 2026