Is CVE-2021-36770 in the CISA KEV catalog?

No. CVE-2021-36770 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-36770?

CVE-2021-36770 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-36770?

CVE-2021-36770 has an EPSS score of 1.40% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-36770?

Upgrade libencode-perl on debian 11 to 3.08-1+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-36770

HIGH

7.8

CVSS v3

NVD

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.

CWE-427

How to fix

Remediation Available

libencode-perlDebian

Fixed in:3.08-1+deb11u1CVE-2021-36770

Fixed in:3.08-2CVE-2021-36770

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

1.40%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Patch2

Third-Party Advisory4

Other references3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.