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PatchSiren cyber security CVE debrief

CVE-2018-11776 Apache CVE debrief

CVE-2018-11776 is an Apache Struts remote code execution vulnerability that CISA has listed in the Known Exploited Vulnerabilities catalog. Because it is tracked as known exploited, organizations using Apache Struts should prioritize remediation over routine maintenance and apply vendor-recommended updates as soon as possible. CISA’s KEV entry cites applying updates per vendor instructions, with the issue added on 2021-11-03 and a due date of 2022-05-03.

Vendor
Apache
Product
Struts
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Security teams, application owners, and operations staff responsible for Apache Struts deployments should care most, especially if the application is internet-facing or part of a high-value service. Vulnerability management and incident response teams should also prioritize it because CISA lists it as known exploited.

Technical summary

The provided official records identify this as an Apache Struts remote code execution issue. CISA’s KEV metadata marks it as actively exploited and directs defenders to apply updates per vendor instructions. The source data does not provide a CVSS score, so prioritization here is driven by known exploitation status and product exposure rather than score alone.

Defensive priority

High. Known exploitation in CISA KEV warrants urgent remediation, exposure review, and verification that affected Apache Struts instances are updated.

Recommended defensive actions

  • Inventory all Apache Struts deployments and identify affected versions.
  • Apply the vendor-recommended updates or mitigations referenced by Apache.
  • Prioritize internet-facing and business-critical systems first.
  • Validate that remediation succeeded and that no unsupported Struts instances remain.
  • Review logs and alerts for suspicious activity on exposed applications.
  • If immediate patching is not possible, isolate or restrict access until updates are applied.

Evidence notes

This debrief is based only on the supplied CVE metadata, CISA KEV metadata, and official resource links. The source data identifies the issue as Apache Struts remote code execution, marks it as known exploited, and provides the KEV dateAdded of 2021-11-03 and dueDate of 2022-05-03. No CVSS score was supplied in the input.

Official resources

Public defensive debrief prepared from supplied official metadata only; no exploit details, reproduction steps, or unsupported claims included.