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[ CVE-2021-39144 · Published 23 Aug 2021 ]

XStream Remote Code Execution Vulnerability

Exploited · CISA KEV CVSS 8.5 EPSS 98%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2023-03-10
  • EPSS: 98% chance of exploitation in the next 30 days (higher than 100% of CVEs)

[ Description ]Official description

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.

CISA: XStream contains a remote code execution vulnerability that allows an attacker to manipulate the processed input stream and replace or inject objects that result in the execution of a local command on the server. This vulnerability can affect multiple products, including but not limited to VMware Cloud Foundation.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 31 Mar 2023): Apply updates per vendor instructions.

[ References ]References