How severe is CVE-2012-0391?

CVE-2012-0391 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2012-0391 being actively exploited?

Yes. CVE-2012-0391 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-01-21, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2012-0391?

CVE-2012-0391 affects Apache Struts. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2012-0391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2012-0391 published?

CVE-2012-0391 was published on 2012-01-08 and last updated on 2026-06-16.

CVE-2012-0391

CVE-2012-0391 is a critical-severity vulnerability in Apache Struts with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-01-21). The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 9.3
EPSS exploit prediction: 76% (99th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-01-21)
Weakness: CWE-94
Affected product: Apache Struts
Published: 2012-01-08
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2012-0391?: 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.
How severe is CVE-2012-0391?: CVE-2012-0391 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2012-0391 being actively exploited?: Yes. CVE-2012-0391 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-01-21, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2012-0391?: CVE-2012-0391 affects Apache Struts. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2012-0391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2012-0391 published?: CVE-2012-0391 was published on 2012-01-08 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*

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