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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).
| Reporter | Title | Published | Views | Family All 29 |
|---|---|---|---|---|
 | The vulnerability of the x509_crt_verify_name function in implementations of TLS and SSL protocols allows a attacker to compromise the integrity of data. | 1 Apr 202200:00 | – | bdu_fstec |
 | ARM mbed TLS 信任管理问题漏洞 | 23 Aug 202100:00 | – | cnnvd |
 | CVE-2020-36477 | 23 Aug 202100:00 | – | cve |
 | CVE-2020-36477 | 23 Aug 202100:00 | – | cvelist |
 | CVE-2020-36477 | 23 Aug 202100:00 | – | debiancve |
 | EUVD-2020-23963 | 7 Oct 202500:30 | – | euvd |
 | GLSA-202301-08 : Mbed TLS: Multiple Vulnerabilities | 11 Jan 202300:00 | – | nessus |
| Linux Distros Unpatched Vulnerability : CVE-2020-36477 | 6 Aug 202500:00 | – | nessus |
 | Mbed TLS: Multiple Vulnerabilities | 11 Jan 202300:00 | – | gentoo |
 | CVE-2020-36477 | 23 Aug 202102:15 | – | nvd |
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03 Sep 2025 22:03Current
7High risk
Vulners AI Score7
CVSS 24.3
CVSS 3.15.9
EPSS0.00771