CVE-2021-39146
8.5 · HIGHOverview
CVE-2021-39146 is a high-severity vulnerability affecting xstream xstream. It was published on August 23, 2021 and has a CVSS 3.1 base score of 8.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to load and execute arbitrary code from a remote 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.
Remediation
Check the references section for vendor advisories and patches from xstream. Update xstream to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| xstream | xstream | >= 0, < 1.4.18 | Affected |
References
Frequently Asked Questions
What is CVE-2021-39146?
CVE-2021-39146 is a high-severity vulnerability affecting xstream xstream. It was published on August 23, 2021 and has a CVSS 3.1 base score of 8.5 (HIGH).
How severe is CVE-2021-39146?
This vulnerability has a CVSS 3.1 base score of 8.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-39146?
Check the references section for vendor advisories and patches from xstream. Update xstream to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-39146?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-39146 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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