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    CVE-2021-36770

    Encode.pm, as distributed in Perl through 5.34.0, allows local users to gain privileges via a Trojan horse Encode::ConfigLocal library (in the current working directory) that preempts dynamic module loading. Exploitation requires an unusual configuration, and certain 2021 versions of Encode.pm (3.05 through 3.11). This issue occurs because the || operator evaluates @INC in a scalar context, and thus @INC has only an integer value.

    Published:Aug 9, 2021
    Last Modified:Nov 3, 2025
    EPS:Aug 11, 2021
    EPSS Score:0.00184
    CVSS Score:7.8

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    P5-encode Project
    Product
    P5-encode
    Vendor
    Perl
    Product
    Perl

    Exploits

    No exploit reference

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    References

    https://github.com/Perl/perl5/commit/c1a937fef07c061600a0078f4cb53fe9c2136bb9
    https://github.com/dankogai/p5-encode/commit/527e482dc70b035d0df4f8c77a00d81f8d775c74
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5NDGQSGMEZ75FJGBKNYC75OTO7TF7XHB/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6KOZYD7BH2DNIAEZ2ZL4PJ4QUVQI6Y33/
    https://metacpan.org/dist/Encode/changes
    https://news.cpanel.com/unscheduled-tsr-10-august-2021/
    https://security-tracker.debian.org/tracker/CVE-2021-36770
    https://security.netapp.com/advisory/ntap-20210909-0003/
    https://github.com/Perl/perl5/commit/c1a937fef07c061600a0078f4cb53fe9c2136bb9
    https://github.com/dankogai/p5-encode/commit/527e482dc70b035d0df4f8c77a00d81f8d775c74
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5NDGQSGMEZ75FJGBKNYC75OTO7TF7XHB/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6KOZYD7BH2DNIAEZ2ZL4PJ4QUVQI6Y33/
    https://metacpan.org/dist/Encode/changes
    https://news.cpanel.com/unscheduled-tsr-10-august-2021/
    https://security-tracker.debian.org/tracker/CVE-2021-36770
    https://security.netapp.com/advisory/ntap-20210909-0003/
    https://security.netapp.com/advisory/ntap-20241108-0002/

    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