DEBIAN-CVE-2020-36477

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    DEBIAN-CVE-2020-36477

    Published: 23 Aug 2021Last Modified: 11 Sept 2026
    Upstream:
    CVE-2020-36477

    Summary:

    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 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).

    References: https://security-tracker.debian.org/tracker/CVE-2020-36477

    Affected packages

    Package

    Name: mbedtls

    Purl: pkg:deb/debian/mbedtls?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.28.0-0.3

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    DEBIAN-CVE-2020-36477 | CVE-DB