HOMEVULNERABILITIESCVE-2025-66215
MEDIUM

CVE-2025-66215

CWE-121Published: March 30, 2026· Updated: Apr 1, 2026

6.8
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:5.1th

Official Description

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.

NVD Source

Technical Analysis

CVE-2025-66215 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorPhysical
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

opensc_project1 product
opensc
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (4)

→
https://github.com/OpenSC/OpenSC/commit/efd1d479832141bcf705c2f47655ada4d5f92f5dPatch
→
https://github.com/OpenSC/OpenSC/pull/3436Issue Tracking · Patch
→
https://github.com/OpenSC/OpenSC/security/advisories/GHSA-q5fc-cw56-hwp2Patch · Vendor Advisory
→
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66215Vendor Advisory

Quick Facts

CVE IDCVE-2025-66215
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-121
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMar 30, 2026

Related CVEs (CWE-121)

CVE-2026-12485
10.0
CVE-2026-12847
10.0
CVE-2026-37541
10.0
CVE-2017-20230
10.0
CVE-2026-12846
10.0
CVE-2026-42996
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2025-66215 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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