XStream · XStream

CVE-2021-39144

XStream is vulnerable to a Remote Command Execution attack

Exploited in attacks High 8.5 Attack chance: 98%

What it is

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.

What to do

Apply updates per vendor instructions.

Deadline for US federal agencies: March 31, 2023

Added to the CISA list: March 10, 2023
Published: August 23, 2021
Severity: High 8.5 CVSS 3.1
Chance of attacks in the next 30 days (EPSS): 98% in the top 0.1% of all known vulnerabilities
Weakness: CWE-94 CWE-502
More details: NVD · CVE.org · CISA

All references (12)

Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.