CVE-2021-3405
6.5 · MEDIUMOverview
CVE-2021-3405 is a medium-severity vulnerability affecting matroska libebml. It was published on February 23, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.
Remediation
Check the references section for vendor advisories and patches from matroska. Update libebml 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 |
|---|---|---|---|
| matroska | libebml | >= 0, < 1.4.2 | Affected |
References
Frequently Asked Questions
What is CVE-2021-3405?
CVE-2021-3405 is a medium-severity vulnerability affecting matroska libebml. It was published on February 23, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2021-3405?
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-3405?
Check the references section for vendor advisories and patches from matroska. Update libebml 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-2021-3405?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-3405 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
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