CVE-2018-20340
6.8 · MEDIUMOverview
CVE-2018-20340 is a medium-severity vulnerability affecting yubico libu2f-host. It was published on March 21, 2019 and has a CVSS 3.0 base score of 6.8 (MEDIUM).
This vulnerability has a CVSS 3.0 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
Yubico libu2f-host 1.1.6 contains unchecked buffers in devs.c, which could enable a malicious token to exploit a buffer overflow. An attacker could use this to attempt to execute malicious code using a crafted USB device masquerading as a security token on a computer where the affected library is currently in use. It is not possible to perform this attack with a genuine YubiKey.
Remediation
Check the references section for vendor advisories and patches from yubico. Update libu2f-host 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 |
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References
Frequently Asked Questions
What is CVE-2018-20340?
CVE-2018-20340 is a medium-severity vulnerability affecting yubico libu2f-host. It was published on March 21, 2019 and has a CVSS 3.0 base score of 6.8 (MEDIUM).
How severe is CVE-2018-20340?
This vulnerability has a CVSS 3.0 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2018-20340?
Check the references section for vendor advisories and patches from yubico. Update libu2f-host 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-2018-20340?
CyberStrike's AI-powered security agents can automatically detect CVE-2018-20340 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.
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