Exploited vulnerabilities / CVE-2016-3081
Confirmed exploited · remote code execution · Apache StrutsCVE-2016-3081
Apache Struts remote code execution, confirmed exploited in the wild.
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.
| CISA's name for it | Apache Struts Command Injection Vulnerability |
|---|---|
| Vendor and product | Apache · Struts |
| Type | remote code execution · CWE-77 |
| Exploited | Confirmed by CISA listed 8 October 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 11 October 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | cwiki.apache.org ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Patch to the fixed version the vendor names, today if the product faces the internet.
Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list.
Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.
| CISA's required action | 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. |
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Know before someone else finds it
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CVE-2016-3081 in short
Is CVE-2016-3081 being exploited?
Yes. CISA added CVE-2016-3081 to its Known Exploited Vulnerabilities catalogue on 8 October 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2016-3081?
US federal agencies must remediate it by 11 October 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2016-3081 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 97%, the 99th percentile of every CVE it scores.
How do I fix CVE-2016-3081?
Patch to the fixed version the vendor names, today if the product faces the internet. Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list. Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.
Other Apache vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-34486 | Tomcat | exploited vulnerability | 4 August 2026 |
| CVE-2026-34197 | ActiveMQ | exploited vulnerability | 16 April 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.