What’s Vulnerable › Vulnerabilities

CVE-2023-42795: Apache Tomcat: Failure during request clean-up leads to sensitive data leaking to subsequent requests

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-10 · updated 2026-06-17
• Weakness: CWE-459

Description

Incomplete Cleanup vulnerability in Apache Tomcat.When recycling various internal objects in Apache 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 9.0.80 and from 8.5.0 through 8.5.93, an error could cause Tomcat to skip some parts of the recycling process leading to information leaking from the current request/response to the next. 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 fixes the issue.

Affected products

• Apache Tomcat: from 8.5.0 before 8.5.94; from 9.0.1 before 9.0.81; from 10.1.1 before 10.1.14; 9.0.0-milestone1, 9.0.0-milestone10, 9.0.0-milestone11, 9.0.0-milestone12, 9.0.0-milestone13, 9.0.0-milestone14 (+52) — fixed in 10.1.14, 8.5.94, 9.0.81
• Debian Linux: 10.0, 11.0, 12.0

How to fix

Upgrade to a fixed version: Apache Tomcat 10.1.14, 8.5.94, 9.0.81. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/065jfyo583490r9j2v73nhpyxdob56lw
• http://www.openwall.com/lists/oss-security/2023/10/10/9
• https://lists.apache.org/thread/065jfyo583490r9j2v73nhpyxdob56lw
• https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html
• https://security.netapp.com/advisory/ntap-20231103-0007/
• https://www.debian.org/security/2023/dsa-5521
• https://www.debian.org/security/2023/dsa-5522

Get alerted when CVE-2023-42795 or the next vulnerability affects your stack