Vulnerability in P5-Crypt-Perl Project
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/FGasper/p5-Crypt-Perl/issues/14 (Third Party Advisory)
- github.com/FGasper/p5-Crypt-Perl/commit/f960ce75502acf7404187231a706672f8369acb2 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-13895?
- CVE-2020-13895 is a high-severity vulnerability in P5-Crypt-Perl Project, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.8/10. Published 2020-06-07.
- How severe is CVE-2020-13895?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-13895 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.