CVE-2023-40660

MEDIUMNVD 6.66.6—
EchelonGraph scoreMEDIUM confidence

Score 6.6 from GitHub Security Advisory published 2023-11-06. NVD baseline CVSS 6.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.6
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.6Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
6.6
EG Score
6.6(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity66% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
56.7%
KEV
Not listed

Published

November 6, 2023

Last Modified

November 3, 2025

References (19)

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopensc-pkcs11 (0.25.0~rc1-1ubuntu0.1~esm1) @ noble2026-05-24ubuntu
ubuntuopensc-pkcs11 (0.20.0-3ubuntu0.1~esm4) @ focal2026-05-24ubuntu
redhatopensc-0:0.20.0-7.el8_92023-12-19redhat
redhatopensc-0:0.23.0-3.el9_32023-12-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 110 total refreshes for this CVE.

  1. 2026-07-23 02:25 UTCEG score recompute
  2. 2026-07-22 23:12 UTCEG score recompute
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Frequently asked(5)

What is CVE-2023-40660?
CVE-2023-40660 is a medium vulnerability published on November 6, 2023. 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…
When was CVE-2023-40660 disclosed?
CVE-2023-40660 was first published in the National Vulnerability Database on November 6, 2023, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-40660 actively exploited?
CVE-2023-40660 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 56.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-40660?
CVE-2023-40660 has a CVSS v3 base score of 6.6 (NVD).
How do I remediate CVE-2023-40660?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-40660, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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