Apache Struts 2 Remote Code Execution Flaw Added to CISA KEV
Key findings • CISA added Apache Struts 2 RCE vulnerability CVE-2016-3081 to its KEV catalog. • The flaw is actively exploited, posing a significant risk to unpatched systems. • CVE-2016-…
Key findings
- CISA added Apache Struts 2 RCE vulnerability CVE-2016-3081 to its KEV catalog.
- The flaw is actively exploited, posing a significant risk to unpatched systems.
- CVE-2016-3081 allows remote code execution, enabling full system compromise.
- Immediate patching of Apache Struts 2 installations is imperative for all organizations.
The Cybersecurity and Infrastructure Security Agency (CISA) has added a significant Apache Struts 2 vulnerability, CVE-2016-3081, to its Known Exploited Vulnerabilities (KEV) catalog. This addition on October 8, 2026, signals that the flaw is no longer a theoretical risk but is actively being leveraged by threat actors in real-world attacks.
CVE-2016-3081 is a remote code execution (RCE) vulnerability affecting Apache Struts 2, a popular open-source web application framework. This type of flaw is particularly dangerous as it allows an attacker to execute arbitrary code on a vulnerable server, potentially leading to full system compromise, data exfiltration, or the deployment of further malicious payloads.
CISA’s KEV catalog serves as a definitive list of vulnerabilities that have been confirmed as actively exploited in the wild. Its inclusion underscores the urgent need for organizations to address this specific flaw. While the vulnerability itself is older, its continued exploitation highlights the persistent risk posed by unpatched, legacy software components within enterprise environments.
Organizations running Apache Struts 2 installations are strongly advised to take immediate action. The primary defense against CVE-2016-3081 is to apply the available security patches provided by Apache. For federal civilian executive branch agencies, CISA’s binding operational directive mandates remediation of KEV catalog vulnerabilities by specific deadlines, emphasizing the critical nature of these updates for all organizations. Prioritizing the patching of actively exploited vulnerabilities like CVE-2016-3081 is essential to protect against ongoing cyber threats and maintain a strong security posture.