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CVE-2020-13895

HIGH
8.8
CVSS Score
Published: June 7, 2020 at 12:56 AM UTC
Updated: June 17, 2026 at 02:53 AM UTC
1 product affected across 1 vendorP5-crypt Perl

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Severity
HIGH8.8
Exploit prediction
EPSS 0.7%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

P5-crypt Perl· P5-crypt Perl Projectcpan
95%
v < 0.32
Affected range stops below 0.32, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/FGasper/p5-Crypt-Perl/commit/f960ce75502acf7404187231a706672f8369acb2
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/FGasper/p5-Crypt-Perl/issues/14

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-347

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