JbossAS - RCE (CVE-2017-12149)

CVE-2017-12149, a vulnerability in JbossAS shipped with Red Hat Enterprise Application Platform 5.2 allows remote code execution due to unsafe deserialization in the ReadOnlyAccessFilter's doFilter method. Attackers can exploit this flaw by sending crafted serialized data, potentially leading to full system compromise and unauthorized execution of arbitrary code on the affected server.

CrowdSec has been tracking this vulnerability and its exploits since 12th of June 2025.

Insights from the CrowdSec network reveal that the attackers trying to exploit CVE-2017-12149 are composed of a fairly even mix of opportunistic and targeted actors. Some attackers employ preliminary reconnaissance, while others use indiscriminate scanning. CrowdSec network telemetry also shows that exploitation of CVE-2017-12149 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attackers exploit JBoss deserialization vulnerabilities by sending crafted POST requests to endpoints like /invoker/readonly, /invoker/jmxinvokerservlet/, and /invoker/ejbinvokerservlet/ to achieve remote code execution.