CVE-2025-66215

6.8 mediumEPSS 0.2%

Medium (6.8) in opensc project opensc. EPSS 0.2% chance of exploitation in the next 30 days.

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with physical access to the computer at the time user or administrator uses a token can cause a stack-buffer-overflow WRITE in card-oberthur. The attack requires crafted USB device or smart card that would present the system with specially crafted responses to the APDUs. This issue has been patched in version 0.27.0.

Severity

CVSS 3.1

6.8 medium

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-31)
CWE: CWE-121
Published: 2026-03-30
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

opensc_project:opensc

References

https://github.com/OpenSC/OpenSC/commit/efd1d479832141bcf705c2f47655ada4d5f92f5d
https://github.com/OpenSC/OpenSC/pull/3436
https://github.com/OpenSC/OpenSC/security/advisories/GHSA-q5fc-cw56-hwp2
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66215

Check your stack JSON