UBUNTU-CVE-2021-33560

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    UBUNTU-CVE-2021-33560

    Published: 8 Jun 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-33560

    Summary:

    Details: Libgcrypt before 1.8.8 and 1.9.x before 1.9.3 mishandles ElGamal encryption because it lacks exponent blinding to address a side-channel attack against mpi_powm, and the window size is not chosen appropriately. This, for example, affects use of ElGamal in OpenPGP.

    References: https://ubuntu.com/security/CVE-2021-33560, https://eprint.iacr.org/2021/923, https://ubuntu.com/security/notices/USN-5080-1, https://ubuntu.com/security/notices/USN-5080-2, https://www.cve.org/CVERecord?id=CVE-2021-33560

    Affected packages

    Package

    Name: libgcrypt20

    Purl: pkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=esm-infra/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.6.5-2ubuntu0.6+esm1

    Affected versions

    1.6.3-2ubuntu1
    1.6.4-3
    1.6.4-4
    1.6.4-5
    1.6.5-2
    1.6.5-2ubuntu0.2
    1.6.5-2ubuntu0.3
    1.6.5-2ubuntu0.4
    1.6.5-2ubuntu0.5
    1.6.5-2ubuntu0.6

    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
    UBUNTU-CVE-2021-33560 | CVE-DB