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CVE-2017-9791 Apache CVE debrief

CVE-2017-9791 is an Apache Struts 1 improper input validation vulnerability. CISA added it to the Known Exploited Vulnerabilities catalog on 2022-02-10, so defenders should treat affected systems as a priority for remediation. The supplied sources do not include a CVSS score, so operational urgency should be driven by the KEV listing and vendor guidance.

Vendor
Apache
Product
Struts 1
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-02-10
Original CVE updated
2022-02-10
Advisory published
2022-02-10
Advisory updated
2022-02-10

Who should care

Security teams that still operate Apache Struts 1, application owners, vulnerability management teams, and anyone responsible for internet-facing Java web applications.

Technical summary

The published records identify an improper input validation weakness in Apache Struts 1. CISA’s KEV entry indicates the issue is known to be exploited in the wild, which makes any remaining Struts 1 deployment a high-priority remediation item. The supplied corpus does not provide deeper technical detail beyond the vulnerability name and KEV status.

Defensive priority

High — treat as urgent for any exposed Apache Struts 1 deployment because CISA lists it as known exploited.

Recommended defensive actions

  • Inventory applications and services that use Apache Struts 1, with special attention to internet-facing systems.
  • Apply updates per vendor instructions as directed by the CISA KEV entry.
  • If remediation cannot be completed immediately, reduce exposure by isolating or removing affected systems from untrusted networks.
  • Verify that remediation is complete and continue scanning for any remaining Struts 1 instances.

Evidence notes

CISA’s KEV feed entry names the issue as “Apache Struts 1 Improper Input Validation Vulnerability,” sets dateAdded to 2022-02-10, dueDate to 2022-08-10, and states the required action is to apply updates per vendor instructions. The corpus also supplies the official CVE record and NVD detail page, but it does not include a CVSS score.

Official resources

CISA added this CVE to the Known Exploited Vulnerabilities catalog on 2022-02-10. The supplied corpus does not include the original vulnerability disclosure date, so the catalog date should not be treated as the issue date.