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CVE-2012-0391 Apache CVE debrief

CVE-2012-0391 is an Apache Struts 2 improper input validation vulnerability that CISA has included in its Known Exploited Vulnerabilities catalog. In the provided CISA record, the vulnerability was added on 2022-01-21 and assigned a remediation due date of 2022-07-21, with the required action to apply updates per vendor instructions. Because it is KEV-listed, organizations using Apache Struts 2 should treat remediation as urgent and verify that all affected deployments are updated through official vendor guidance.

Vendor
Apache
Product
Struts 2
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-01-21
Original CVE updated
2022-01-21
Advisory published
2022-01-21
Advisory updated
2022-01-21

Who should care

Security teams, application owners, and administrators responsible for Apache Struts 2 deployments.

Technical summary

The official records identify CVE-2012-0391 as an improper input validation issue in Apache Struts 2. CISA’s KEV listing indicates the vulnerability has been exploited in the real world, which makes it a priority for inventory, patching, and exposure review. The provided corpus does not include CVSS scoring or affected-version detail, so follow the official Apache and NVD references for scope confirmation.

Defensive priority

Very high. CISA KEV-listed vulnerabilities should be treated as urgent remediation items, especially in production or externally reachable systems.

Recommended defensive actions

  • Review the official Apache, CVE, and NVD references to confirm affected Struts 2 versions and vendor remediation guidance.
  • Apply vendor-provided updates or mitigations as soon as possible; CISA’s required action is to apply updates per vendor instructions.
  • Inventory all applications and services that use Apache Struts 2, including embedded or transitive dependencies.
  • Verify patch deployment after remediation and confirm the vulnerable component is no longer present.
  • Prioritize systems that are business-critical or exposed to untrusted traffic.

Evidence notes

The source corpus includes a CISA KEV entry naming CVE-2012-0391 as 'Apache Struts 2 Improper Input Validation Vulnerability,' with dateAdded 2022-01-21, dueDate 2022-07-21, and requiredAction 'Apply updates per vendor instructions.' The corpus also marks knownRansomwareCampaignUse as Unknown. No CVSS score was provided in the supplied data.

Official resources

Public debrief based only on the supplied official CVE/CISA KEV metadata. No exploit code, reproduction steps, or unsupported impact claims are included.