Apache Shiro Remember Me Deserialization Remote Code Execution
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
Apache Shiro before 1.2.5, when a cipher key has not been configured for the "remember me" feature, allows remote attackers to execute arbitrary code or bypass intended access restrictions via an unspecified request parameter.
Techniques marked “observed” are corroborated by threat intelligence; the rest are inferred from the weakness type (CWE) and attack vector.
Corroborated threat activity referencing this CVE — with source and confidence, not inference.
These techniques were analysed against this CVE's real-world exploitation — the matching entries in the ATT&CK chain above are marked “observed”.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
Immediately ensure a strong, unique cipher key is explicitly configured for the Apache Shiro "remember me" feature, as described in Shiro documentation. If the feature is not critical, disable "remember me" functionality entirely to eliminate this attack vector. Additionally, implement strict network segmentation and monitor application logs for suspicious activity indicative of exploitation.
The permanent resolution is to upgrade Apache Shiro to version 1.2.5 or later immediately. All versions prior to 1.2.5 are affected by this vulnerability. Ensure all dependencies are updated and thoroughly test the application after the upgrade.
An unauthenticated remote attacker can exploit this vulnerability to execute arbitrary code on the server running Apache Shiro, or bypass authentication and access controls. This allows for complete compromise of the application and underlying system, leading to data exfiltration, service disruption, and significant business reputational damage.
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