CVE-2020-16156: fedoraproject fedora
CVSS: 7.8v3.1HighModified
AliasesMGASA-2022-0018RHSA-2025:8432UBUNTU-CVE-2020-16156USN-5689-1DEBIAN-CVE-2020-16156
Published 13-12-2021Last modified 03-11-2025
Vulnerability summary
CVE-2020-16156 is a high (CVSS 7.8) vulnerability in fedoraproject fedora. EPSS estimates a 0.86% chance of exploitation in the next 30 days, higher than 58% of scored vulnerabilities. 2 public exploits are recorded.
CVSS score
7.8/10
010
High · v3.1 (NVD)EPSS score
0.86%
0%100%
Low · +0.06 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits2reference
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 13-12-2021PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
Description
CPAN 2.28 allows Signature Verification Bypass.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 7.8Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · Red hatEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.86%
Chance of exploitation in the next 30 days
Percentile
58%
Versus all other CVEs
30-day change
+0.06 pp
From 0.80% on 22-09-2026
22-09-202622-10-2026
EPSS score0.86%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (blog.hackeriet.no)
Maturity: unknown
Exploit Reference (blogs.perl.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- perl< 5.36.0-4
Fedoraproject1 product
- fedoraEOL34 | 35
Mageia1 product
- perl-CPAN< 2.290.0-1.mga8
Perl1 product
- comprehensive_perl_archive_network2.28 | 2.28:trial
Redhat1 product
- perl-CPAN< 0:2.18-402.el8_10
Ubuntu1 product
- perl< 5.18.2-2ubuntu1.7+esm4 | < 5.22.1-9ubuntu0.9+esm1 | < 5.26.1-6ubuntu0.6 | < 5.30.0-9ubuntu0.3 | < 5.34.0-3ubuntu1.1
6 vendors · 6 products
References
20 links- blog.hackeriet.no/cpan-signature-verification-vulnerabilities/X Refsource MISCARTICLEREPORTExploitThird Party Advisory
- blogs.perl.org/users/neilb/2021/11/addressing-cpan-vulnerabilities-related-to-checksums.htmlX Refsource MISCARTICLEREPORTExploitThird Party Advisory
