CVE-2021-39144
XStream Remote Code Execution Vulnerability
What is affected
| Vendor | XStream |
|---|---|
| Product | XStream |
| Weakness | CWE-94, CWE-502 |
The vulnerability
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.
Required action
Apply updates per vendor instructions.
US federal civilian agencies were required to act by 31 March 2023 under BOD 22-01. The deadline is a compliance date, not a measure of severity — it says nothing about how dangerous the flaw is to anyone else.
Where this comes from
Every field on this page is taken from the CISA Known Exploited Vulnerabilities catalog, last synced 13 Nov 2026, 00:30. Nothing here is our own assessment. For the technical scoring, see the NVD record below.