CVE Tools
Sign in

CVE-2021-21350

XStream is vulnerable to an Arbitrary Code Execution attack

Published: Mar 22, 2021Updated: May 23, 2025 Sources: CVE List NVD GHSA BDUCWE-434
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
15.6%
Top 3.6%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

Description

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to execute arbitrary code 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. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-434CWE-502NVD-CWE-noinfo

Affected Products

xstreamx-stream
Library
OSS Libraries / maven
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
UbuntuCanonical Ltd.
On-premOS
Operating Systems / linux-distro
Oracle Communications Unified Inventory ManagementOracle Corp.
On-premWeb App
Enterprise Software / itsm-monitoring
x-streamoss-projectOSS Librariesaka xstream
red hat inc.commercialUSOperating Systemsaka red hat
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
canonical ltd.commercialGBOperating Systemsaka canonical
oracle corp.commercialUSDatabasesaka oracle
and 45 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available

MITRE ATT&CK

5 techniques
Command and Control
Execution
Initial Access
Persistence
View detailed technique mapping

References

https://x-stream.github.io/security.html#workaround
x-stream.github.io
http://x-stream.github.io/changes.html#1.4.16
x-stream.github.io
https://github.com/x-stream/xstream/security/advisories/GHSA-43gc-mjxg-gvrq
github.com
and 38 more references View all →

Timeline

Published
Mar 22, 2021
Last Updated
May 23, 2025

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-21350 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows