CVE-2020-13895: Crypt::Perl::ECDSA in the Crypt::Perl (aka p5-Crypt-Perl) module before 0.32 for Perl fails to verify correct

Q: How do I fix CVE-2020-13895?

p5-crypt-perl: upgrade to 0.32. Exact commands for each OS are on this page.

Q: Is CVE-2020-13895 being exploited?

CVE-2020-13895 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-13895 affect?

CVE-2020-13895 affects p5-crypt-perl. Severity is high (CVSS 8.8). Crypt::Perl::ECDSA in the Crypt::Perl (aka p5-Crypt-Perl) module before 0.32 for Perl fails to verify correct ECDSA signatures when r and s are small and when s = 1. This happens when using the curve secp256r1 (prime256v1). This could conce

This month

HIGH 8.8UPGRADE

CVE-2020-13895 is a high-severity flaw (CVSS 8.8) affecting p5-crypt-perl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Crypt::Perl::ECDSA in the Crypt::Perl (aka p5-Crypt-Perl) module before 0.32 for Perl fails to verify correct ECDSA signatures when r and s are small and when s = 1. This happens when using the curve secp256r1 (prime256v1). This could conceivably have a security-relevant impact if an attacker wishes to use public r and s values when guessing whether signature verification will fail.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-347
Published	2020-06-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: p5-crypt-perl project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-06-07 01:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

p5-crypt-perl project p5-crypt-perl UPGRADE

Affected: < 0.32

Fixed in: 0.32

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy p5-crypt-perl || rpm -q p5-crypt-perl || p5-crypt-perl --version

2. UPGRADE to 0.32 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade p5-crypt-perl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade p5-crypt-perl

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-13895?

p5-crypt-perl: upgrade to 0.32. Exact commands for each OS are on this page.

Is CVE-2020-13895 being exploited?

CVE-2020-13895 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-13895 affect?

CVE-2020-13895 affects p5-crypt-perl. Severity is high (CVSS 8.8). Crypt::Perl::ECDSA in the Crypt::Perl (aka p5-Crypt-Perl) module before 0.32 for Perl fails to verify correct ECDSA signatures when r and s are small and when s = 1. This happens when using the curve secp256r1 (prime256v1). This could conce

How urgent is CVE-2020-13895?

Priority 44/100. High severity

Software pages

Perl vulnerabilities

Related CVEs

CVE-2020-17478 HIGH 7.5 UPGRADE ECDSA/EC/Point.pm in Crypt::Perl before 0.33 does not properly consider timing attacks against the EC point mu

References

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