CVE-2020-36477
5.9 · MEDIUMOverview
CVE-2020-36477 is a medium-severity vulnerability affecting arm mbed_tls. It was published on August 23, 2021 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
An issue was discovered in Mbed TLS before 2.24.0. The verification of X.509 certificates when matching the expected common name (the cn argument of mbedtls_x509_crt_verify) with the actual certificate name is mishandled: when the subjecAltName extension is present, the expected name is compared to any name in that extension regardless of its type. This means that an attacker could impersonate a 4-byte or 16-byte domain by getting a certificate for the corresponding IPv4 or IPv6 address (this would require the attacker to control that IP address, though).
Remediation
Check the references section for vendor advisories and patches from arm. Update mbed_tls 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 |
|---|---|---|---|
| arm | mbed_tls | >= 0, < 2.24.0 | Affected |
Frequently Asked Questions
What is CVE-2020-36477?
CVE-2020-36477 is a medium-severity vulnerability affecting arm mbed_tls. It was published on August 23, 2021 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
How severe is CVE-2020-36477?
This vulnerability has a CVSS 3.1 base score of 5.9, 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-2020-36477?
Check the references section for vendor advisories and patches from arm. Update mbed_tls 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-2020-36477?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-36477 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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