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Fencer Vulns
high 7.8

CVE-2020-16154 json

The App::cpanminus package 1.7044 for Perl allows Signature Verification Bypass.

published 2021-12-13 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-8120

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

The App::cpanminus package 1.7044 for Perl allows Signature Verification Bypass.

Patch / fix

  • cpanminus Debian 14, Debian 13, Debian 12 1.7045-1

debian advisories DEBIAN-CVE-2020-16154

  • cpanminus Ubuntu 22.04 LTS 1.7045-1
  • cpanminus Ubuntu Pro 16.04 LTS 1.7040-1ubuntu0.1~esm1
  • cpanminus Ubuntu Pro 18.04 LTS 1.7043-1ubuntu0.1~esm1
  • cpanminus Ubuntu Pro 20.04 LTS 1.7044-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-16154

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perl-App-cpanminus openSUSE Tumbleweed 1.7045-1.1
  • perl-App-cpanminus Package Hub 15 SP3, openSUSE Leap 15.3 1.7045-bp153.2.3.1

opensuse advisories openSUSE-SU-2024:11783-1openSUSE-SU-2022:0074-1

  • perl-app-cpanminus Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 1.7045-r0

alpine advisories ALPINE-CVE-2020-16154

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-16154 updated cvss 7.8

perl-App-cpanminus: Bypass of verification of signatures in CHECKSUMS files

  • Red Hat Enterprise Linux 7 perl-App-cpanminus
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 perl-File-pushd, perl-Parse-PMFile, perl-App-cpanminus, perl-CPAN-Meta-Check, perl-Module-CPANfile, perl-CPAN-DistnameInfo, +1 more Red Hat Enterprise Linux 9 perl-App-cpanminus Red Hat Software Collections rh-perl530-perl-App-cpanminus
    affected: workaround, no fix planned “Will not fix”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.hackeriet.no https://blog.hackeriet.no/cpan-signature-verification-vulnerabilities/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.