DEBIAN-CVE-2020-36477
- Source
- https://security-tracker.debian.org/tracker/CVE-2020-36477
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2020-36477.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2020-36477
- Upstream
- Published
- 2021-08-23T02:15:07Z
- Modified
- 2025-09-25T22:40:19Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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 mbedtlsx509crt_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).
- References
Affected packages
Debian:12 / mbedtls
Package
- Name
- mbedtls
- Purl
- pkg:deb/debian/mbedtls?arch=source
Debian:13 / mbedtls
Package
- Name
- mbedtls
- Purl
- pkg:deb/debian/mbedtls?arch=source
Debian:14 / mbedtls
Package
- Name
- mbedtls
- Purl
- pkg:deb/debian/mbedtls?arch=source