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Exploited vulnerability · CISA KEV

Is CVE-2016-3081 exploited? Yes: in CISA KEV since 8 Oct 2026

Gociux · Apache Struts · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2016-3081, Apache Struts Command Injection Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 8 Oct 2026, 3817 days after it was published. It affects Apache Struts. If you run it, CISA's required action is: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

exploitedYesCISA KEV · 8 Oct 2026
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity8.1CVSS 3.1 · high
US federal due11 Oct 2026BOD 22-01 deadline

What it is

Apache Struts contains a command injection vulnerability that could allow remote attackers to execute arbitrary code via method:prefix when Dynamic Method Invocation is enabled.

VendorApache (41 exploited CVEs in KEV)
ProductStruts
VulnerabilityApache Struts Command Injection Vulnerability
WeaknessCWE-77
Published26 Apr 2016
Added to KEV8 Oct 2026
Reported by (CNA)redhat

What to do

  1. Check whether you run it. Look for Struts in your asset inventory, including appliances and cloud images. Stack check lists every exploited Apache CVE at once.
  2. Apply the fix. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 26 Apr 2016.
  4. Get told next time. Email alerts when CISA adds a CVE for Apache.

Other exploited CVEs in Struts

References

Questions

Is CVE-2016-3081 being exploited?

Yes. CISA added CVE-2016-3081 to the Known Exploited Vulnerabilities catalog on 8 Oct 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2016-3081 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2016-3081?

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Check Apache's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Struts and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in October 2026 · Apache scorecard · act-now radar.

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