CVE-2021-39144
Actively exploited. CVE-2021-39144 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-03-10) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2021-39144 is indexed in Metasploit and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
CSIRTS triage
- What
- XStream contains a remote code execution vulnerability that allows an attacker to manipulate the processed input stream.
- Who is affected
- Users of XStream and products that utilize it, including VMware Cloud Foundation.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Update XStream to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2021-39144 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- MetasploitA Metasploit Framework module targets this CVE — weaponized, point-and-click exploitation.look it up ↗
- NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2021-39144: XStream Remote Code Execution Vulnerabilitycisa-kev · 2023-03-10
External references
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[](https://www.csirts.com/cve/CVE-2021-39144)