Is CVE-2021-39144 actively exploited?

Yes. CVE-2021-39144 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-39144 be exploited remotely?

The attack vector of CVE-2021-39144 has not been classified yet.

What is the CVSS score of CVE-2021-39144?

CVE-2021-39144 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-39144

HIGHCISA KEVIN THE WILD

CVE-2021-39144

Published: March 10, 2023

EPSS:94.38%probability of exploitation in 30 daysPercentile:100.0th

Official Description

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.

NVD Source

CISA KEV Advisory

XStream Remote Code Execution Vulnerability

Added to KEV: 2023-03-10Federal patch deadline: 2023-03-31

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

XStream contains a remote code execution vulnerability that allows an attacker to manipulate input streams to execute local commands on the server. With an EPSS score of 0.94380, there is a very high likelihood of this vulnerability being exploited, making it a critical concern for affected products like VMware Cloud Foundation.

This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog, confirming its use by adversaries. The nature of the flaw suggests it is remotely exploitable by manipulating input streams.

Recommended Action

Apply the latest security updates for XStream and any affected products, such as VMware Cloud Foundation. Implement input validation and serialization filtering to prevent the injection of malicious objects.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-39144 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-39144 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.