CVE-2012-0391
Apache Struts 2 Improper Input Validation Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 21 Jan 2022
- A public exploit reference is listed
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.
Key facts
- Published
- 8 Jan 2012
- Last changed
- 22 Oct 2025
- Assigned by
- mitre
- KEV added
- 21 Jan 2022
- KEV fix due
- 21 Jul 2022
- EPSS
- 75.599% likely to be exploited in the next 30 days, higher than 99.527% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 8 Jan 2012 Published
- 21 Jan 2022 CVE-2012-0391 added to CISA KEV
- 21 Jan 2022 Added to the CISA KEV catalogue