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CVE-2021-36770

7.8 · HIGH

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 modul…

Published Aug 11, 2021CWE-427EPSS 1.39%

Overview

CVE-2021-36770 is a high-severity vulnerability. It was published on August 11, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/Perl/perl5/commit/c1a937fef07c061600a0078f4cb53fe9c2136bb9GitHubgithub.com/dankogai/p5-encode/commit/527e482dc70b035d0df4f8c77a00d81f8d775c74Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5NDGQSGMEZ75FJGBKNYC75OTO7TF7XHB/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6KOZYD7BH2DNIAEZ2ZL4PJ4QUVQI6Y33/Refmetacpan.org/dist/Encode/changesRefnews.cpanel.com/unscheduled-tsr-10-august-2021/Refsecurity-tracker.debian.org/tracker/CVE-2021-36770Refsecurity.netapp.com/advisory/ntap-20210909-0003/GitHubgithub.com/Perl/perl5/commit/c1a937fef07c061600a0078f4cb53fe9c2136bb9GitHubgithub.com/dankogai/p5-encode/commit/527e482dc70b035d0df4f8c77a00d81f8d775c74

How CyberStrike helps

Frequently asked questions

What is CVE-2021-36770?

CVE-2021-36770 is a high-severity vulnerability. It was published on August 11, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-36770?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-36770?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-36770?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-36770 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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