TI-2025-40718 Aliases CVE-2025-66215

OpenSC: Stack-buffer-overflow WRITE in card-oberthur

LOW 29CWE-121Published 2026-03-30 · Updated 2026-03-31

Key facts

Attack vector: Physical
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-121 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00165 5th percentileScored 2026-11-07

Fix Partial OpenSC (OpenSC): 0.27.0Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OpenSC	OpenSC	before 0.27.0	0.27.0	Patch available	CNA

OpenSC VendorOpenSC Affected before 0.27.0 Fixed in 0.27.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:opensc_project:opensc::::::::	before 0.27.0	Vulnerable	OpenSC

cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:* Versions before 0.27.0 Vulnerable ·OpenSC

Remediation

Fix · CNA OpenSC (OpenSC) Fixed in 0.27.0

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2025-66215

References

Patch 3

Advisory 1

https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66215

TI-2025-40564 OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers CVSS 3.1MEDIUM 6.8
TI-2025-40563 OpenSC: Out of Bounds vulnerability CVSS 3.1MEDIUM 6.8
TI-2019-04558 sc_context_create in ctx.c in libopensc in OpenSC 0.19.0 has a memory leak, as demonstrated by a call from eidenv. CVSS 3.0HIGH 7.5
TI-2021-13306 Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs. CVSS 3.1HIGH 7.5
TI-2019-12067 An issue was discovered in the pam_p11 component 0.2.0 and 0.3.0 for OpenSC. CVSS 3.0HIGH 7.5
TI-2023-21453 Opensc: potential pin bypass when card tracks its own login state CVSS 3.1MEDIUM 6.6

See all 49 →

Sources

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