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Case File

CVE-2021-21343

MEDIUM · CVSS 5.3 EPSS 46.67% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-03-23 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 5.3. It affects Java. Public exploit code or proof-of-concept references have been detected in its references. Its EPSS score suggests a 46.7% probability of exploitation in the next 30 days.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-21343
Severity
MEDIUM
CVSS
5.3
EPSS
46.67%
Java

Original NVD 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 where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in the deletion of a file on the local host. 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.

Related CVEs

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