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TI-2020-10321 Aliases CVE-2020-13131GHSA-rx8c-cr48-p2ff

An issue was discovered in Yubico libykpiv before 2.1.0.

Priority LOW 21CWE-125Published · Updated

Key facts

Attack vector
Physical
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

An issue was discovered in Yubico libykpiv before 2.1.0. lib/util.c in this library (which is included in yubico-piv-tool) does not properly check embedded length fields during device communication. A malicious PIV token can misreport the returned length fields during RSA key generation. This will cause stack memory to be copied into heap allocated memory that gets returned to the caller. The leaked memory could include PINs, passwords, key material, and other sensitive information depending on the integration. During further processing by the caller, this information could leak across trust boundaries. Note that RSA key generation is triggered by the host and cannot directly be triggered by the token.

Why it matters now

EPSS 0.00492 42nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:yubico:libykpiv:*:*:*:*:*:*:*:*before 2.1.0VulnerableYubico
cpe:2.3:a:yubico:piv_tool_manager:*:*:*:*:*:*:*:*before 2.0.0VulnerableYubico
cpe:2.3:a:yubico:yubikey_smart_card_minidriver:*:*:*:*:*:*:*:*up to 4.1.0.172VulnerableYubico
  • cpe:2.3:a:yubico:libykpiv:*:*:*:*:*:*:*:* Versions before 2.1.0 Vulnerable ·Yubico
  • cpe:2.3:a:yubico:piv_tool_manager:*:*:*:*:*:*:*:* Versions before 2.0.0 Vulnerable ·Yubico
  • cpe:2.3:a:yubico:yubikey_smart_card_minidriver:*:*:*:*:*:*:*:* Versions up to 4.1.0.172 Vulnerable ·Yubico

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-13131
  2. 2026-10-03 Alias added: GHSA-rx8c-cr48-p2ff

References

Exploit 1

Advisory 1

  • TI-2020-10322 An issue was discovered in Yubico libykpiv before 2.1.0. CVSS 3.1MEDIUM 4.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences