How severe is CVE-2020-13895?

CVE-2020-13895 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-13895 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-13895?

CVE-2020-13895 affects P5-crypt-perl Project P5-crypt-perl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-13895?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-13895 published?

CVE-2020-13895 was published on 2020-06-07 and last updated on 2026-06-17.

CVE-2020-13895

CVE-2020-13895 is a high-severity vulnerability in P5-crypt-perl Project P5-crypt-perl with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: P5-crypt-perl Project P5-crypt-perl
Published: 2020-06-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-13895?: 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.
How severe is CVE-2020-13895?: CVE-2020-13895 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-13895 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-13895?: CVE-2020-13895 affects P5-crypt-perl Project P5-crypt-perl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-13895?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-13895 published?: CVE-2020-13895 was published on 2020-06-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:p5-crypt-perl_project:p5-crypt-perl:*:*:*:*:*:perl:*:*

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