XStream Remote Code Execution via Deserialization Vulnerability
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An attacker with a basic user account, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.
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 implement XStream's security framework by configuring a strict whitelist of allowed types, permitting only the absolute minimum required for application functionality. Employ network segmentation to restrict access to systems utilizing XStream and ensure robust input validation is in place for all XML data processing. Monitor logs for unusual process execution or outbound connections originating from XStream-enabled applications.
Upgrade XStream to version 1.4.18 or higher to address this deserialization vulnerability, as these versions implement a secure whitelist-by-default approach. Ensure that all applications using XStream are updated to this patched version to permanently eliminate the risk of remote code execution. Prior versions that do not enforce a strict type whitelist are susceptible to this flaw.
A remote attacker with sufficient rights can execute arbitrary commands on the host by manipulating the XML input stream processed by XStream. This allows for full system compromise, data exfiltration, or further lateral movement within the network. The business impact includes severe data breaches, service disruption, significant reputational damage, and potential regulatory fines.
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