HOMEVULNERABILITIESCVE-2025-66037
MEDIUM

CVE-2025-66037

CWE-125Published: March 30, 2026· Updated: Apr 1, 2026

6.8
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:0.3th

Official Description

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input to the fuzz_pkcs15_reader harness causes OpenSC to perform an out-of-bounds heap read in the X.509/SPKI handling path. Specifically, sc_pkcs15_pubkey_from_spki_fields() allocates a zero-length buffer and then reads one byte past the end of that allocation. This issue has been patched in version 0.27.0.

NVD Source

Technical Analysis

CVE-2025-66037 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

ADVISORYhttps://github.com/OpenSC/OpenSC/security/advisories/GHSA-m58q-rmjm-mmfx
ADVISORYhttps://github.com/OpenSC/OpenSC/wiki/CVE-2025-66037

All References (2)

→
https://github.com/OpenSC/OpenSC/security/advisories/GHSA-m58q-rmjm-mmfxExploit · Vendor Advisory
→
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66037Vendor Advisory

Quick Facts

CVE IDCVE-2025-66037
CVSS Score6.8 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMar 30, 2026

Related CVEs (CWE-125)

CVE-2026-34987
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CVE-2026-42799
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CVE-2026-33642
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CVE-2025-15646
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CVE-2026-24213
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CVE-2026-10881
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2025-66037 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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