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CVE-2012-0391

Critical CVSS 9.8 Known exploited

Published 2012-01-08 · last changed 2026-06-16 · added to CISA KEV 2022-01-21

This one is being exploited in the wild.

CISA added CVE-2012-0391 to the Known Exploited Vulnerabilities catalog on 2022-01-21. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2012-0391, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

The ExceptionDelegator component in Apache Struts before 2.2.3.1 interprets parameter values as OGNL expressions during certain exception handling for mismatched data types of properties, which allows remote attackers to execute arbitrary Java code via a crafted parameter.

Sources

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