Vulnerability Report

CVE-2020-13131

Title: Yubico Yubikey Smart Card Minidriver Memory Corruption

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2020-13131.

CWE Category CWE-125
Published Date Jul 09, 2020
Modified Date Jun 17, 2026
Exploit Status Not Found
Score 4.3 CVSS v3.1
Exploit Probability (EPSS)
0.49%

Vulnerability Summary

CVE-2020-13131: 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.

Impacted Vendors

Y
yubico 3

Reference Links

https://blog.inhq.net/posts/yubico-libykpiv-vuln/ https://www.yubico.com/products/services-software/download/smart-card-drivers-tools/ https://blog.inhq.net/posts/yubico-libykpiv-vuln/ https://www.yubico.com/products/services-software/download/smart-card-drivers-tools/
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
4.3
Attack Vector
PHYSICAL
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v3.0
Source Entity [email protected]
Severity MEDIUM
4.3
Attack Vector
PHYSICAL
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.0/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CVSS v2.0
Source Entity [email protected]
Severity LOW
1.9
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:L/AC:M/Au:N/C:P/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2020-13131 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector PHYSICAL
Complexity LOW
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected Stack

No specific products linked.