{"cve":"CVE-2023-40660","nvd":{"published":"2023-11-06T17:15:11.757","modified":"2026-06-17T06:18:57.337","status":"Modified","description":"A flaw was found in OpenSC packages that allow a potential PIN bypass. When a token/card is authenticated by one process, it can perform cryptographic operations in other processes when an empty zero-length pin is passed. This issue poses a security risk, particularly for OS logon/screen unlock and for small, permanently connected tokens to computers. Additionally, the token can internally track login status. This flaw allows an attacker to gain unauthorized access, carry out malicious actions, or compromise the system without the user's awareness.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":6.6},"cwes":["CWE-287"],"references":["https://access.redhat.com/errata/RHSA-2023:7876","https://access.redhat.com/errata/RHSA-2023:7879","https://access.redhat.com/security/cve/CVE-2023-40660","https://bugzilla.redhat.com/show_bug.cgi?id=2240912","https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651"],"products":["opensc_project:opensc","redhat:enterprise_linux"],"source":"nvd","synced_at":"2026-10-19T21:40:11.519948003+00:00"},"epss":{"cve":"CVE-2023-40660","score":0.01038,"percentile":0.63974,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}