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CVE-2021-36770

HIGH
7.8
CVSS Score
Published: August 11, 2021 at 10:49 PM UTC
Updated: June 17, 2026 at 03:59 AM UTC
2 products affected across 2 vendorsFedoraP5-encode· also runs on 1 platform

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Severity
HIGH7.8
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
3334
P5-encode· P5-encode Project
95%
3.05 ≤ v < 3.12
Affected range stops below 3.12, so it looks safe — our inference, not a vendor statement
perl-perl (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

References (9)

x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/Perl/perl5/commit/c1a937fef07c061600a0078f4cb53fe9c2136bb9
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/dankogai/p5-encode/commit/527e482dc70b035d0df4f8c77a00d81f8d775c74
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5NDGQSGMEZ75FJGBKNYC75OTO7TF7XHB/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6KOZYD7BH2DNIAEZ2ZL4PJ4QUVQI6Y33/
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://metacpan.org/dist/Encode/changes
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://news.cpanel.com/unscheduled-tsr-10-august-2021/
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://security-tracker.debian.org/tracker/CVE-2021-36770
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20210909-0003/

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-427

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