CVE-2021-27217

    Dashboard / Vulnerabilities / CVE-2021-27217

    CVE-2021-27217

    Published: 4 Mar 2021Last Modified: 9 Jul 2026

    Summary:

    Details: An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. The yubihsm-shell project is included in the YubiHSM 2 SDK product.

    References: https://github.com/Yubico/yubihsm-shell/releases, https://www.yubico.com/support/security-advisories/ysa-2021-01/, https://blog.inhq.net/posts/yubico-libyubihsm-vuln2

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.0.3
    2.0.2
    2.0.1
    2.0.0

    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
    CVE-2021-27217 | CVE-DB