CVE-2020-13895

Name: CVE-2020-13895
Creator: NVD / NIST
Published: 2020-06-07T01:15:10.55+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.71%

Last modified Jun 17, 2026

CVE-2020-13895 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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). EPSS estimates a 0.71% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.71%

48.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
P5-Crypt-Perl Project	P5-Crypt-Perl	< 0.32

References

https://github.com/FGasper/p5-Crypt-Perl/commit/f960ce75502acf7404187231a706672f8369acb2Patch, Third Party Advisory
https://github.com/FGasper/p5-Crypt-Perl/issues/14Third Party Advisory
https://github.com/FGasper/p5-Crypt-Perl/commit/f960ce75502acf7404187231a706672f8369acb2Patch, Third Party Advisory
https://github.com/FGasper/p5-Crypt-Perl/issues/14Third Party Advisory

Timeline

Published: Jun 7, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13895?

How severe is CVE-2020-13895?

CVE-2020-13895 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.71% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13895?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13895?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST