Priority reviewHigh

CVE-2021-25329

Apache Software Foundation Apache Tomcat, tomcat, debian linux

The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.

CVSS: 7
EPSS: 9.49%
CISA KEV: Not listed
Published: 2021.03.01

PRIORITY ASSESSMENT

Priority review

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV

Exploit probability9.49%

Technical severityCVSS 7

Vulnerability overview

Affected product and versions

Product: Apache Software Foundation Apache Tomcat, tomcat, debian linux
Affected versions: >= Apache Tomcat 10 < 10.0.0, >= Apache Tomcat 9 < 9.0.41, >= Apache Tomcat 8.5 < 8.5.61, >= Apache Tomcat 7 < 7.0.107, >= 7.0.0 <= 7.0.107, >= 8.5.0 <= 8.5.61, >= 9.0.0 <= 9.0.41, 9.0.0, 10.0.0, 9.0, 10.0, 9.3.3, 9.3.6, 1.14.0, 1.6.0, 10.0.1.5.0, 12.2.0.1, 19c, 21c, < 21.3.0
Fixed versions: 21.3.0, 21.9

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Apache Software Foundation Apache Tomcat, tomcat, debian linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: Not available