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    CVE-2021-33560

    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.

    Published:Jun 2, 2021
    Last Modified:Dec 3, 2025
    EPS:Jun 8, 2021
    EPSS Score:0.00629
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Gnupg
    Product
    Libgcrypt
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Binding Support Function
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Network Function Cloud Native Environment
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Network Repository Function
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Network Slice Selection Function
    Vendor
    Oracle
    Product
    Communications Cloud Native Core Service Communication Proxy
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://github.com/IBM/PGP-client-checker-CVE-2021-33560

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    References

    https://dev.gnupg.org/T5305
    https://dev.gnupg.org/T5328
    https://dev.gnupg.org/T5466
    https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61
    https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/
    https://security.gentoo.org/glsa/202210-13
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html
    https://www.oracle.com/security-alerts/cpuoct2021.html
    https://dev.gnupg.org/T5305
    https://dev.gnupg.org/T5328
    https://dev.gnupg.org/T5466
    https://dev.gnupg.org/rCe8b7f10be275bcedb5fc05ed4837a89bfd605c61
    https://lists.debian.org/debian-lts-announce/2021/06/msg00021.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BKKTOIGFW2SGN3DO2UHHVZ7MJSYN4AAB/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7OAPCUGPF3VLA7QAJUQSL255D4ITVTL/
    https://security.gentoo.org/glsa/202210-13
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html
    https://www.oracle.com/security-alerts/cpuoct2021.html

    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