How severe is CVE-2025-66037?

CVE-2025-66037 has a CVSS 3.x base score of 3.9, rated low severity. It is exploitable over physical access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-66037 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66037?

CVE-2025-66037 affects Opensc Project Opensc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66037?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66037 have an EU (EUVD) identifier?

Yes. CVE-2025-66037 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209126.

When was CVE-2025-66037 published?

CVE-2025-66037 was published on 2026-03-30 and last updated on 2026-06-17.

CVE-2025-66037

CVE-2025-66037 is a low-severity vulnerability in Opensc Project Opensc with a CVSS 3.x base score of 3.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Low (CVSS 3.x base score 3.9)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-209126
Weakness: CWE-125
Affected product: Opensc Project Opensc
Published: 2026-03-30
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-66037?: 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.
How severe is CVE-2025-66037?: CVE-2025-66037 has a CVSS 3.x base score of 3.9, rated low severity. It is exploitable over physical access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-66037 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66037?: CVE-2025-66037 affects Opensc Project Opensc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66037?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66037 have an EU (EUVD) identifier?: Yes. CVE-2025-66037 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-209126.
When was CVE-2025-66037 published?: CVE-2025-66037 was published on 2026-03-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*

More vulnerabilities in Opensc Project Opensc

CVE-2021-34193 — High (CVSS 7.5): Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs.
CVE-2019-16058 — High (CVSS 7.5): An issue was discovered in the pam_p11 component 0.2.0 and 0.3.0 for OpenSC. If a smart card creates a signature with a…
CVE-2019-6502 — High (CVSS 7.5): sc_context_create in ctx.c in libopensc in OpenSC 0.19.0 has a memory leak, as demonstrated by a call from eidenv.
CVE-2023-2977 — High (CVSS 7.1): A vulnerbility was found in OpenSC. This security flaw cause a buffer overrun vulnerability in pkcs15…
CVE-2019-20792 — Medium (CVSS 6.8): OpenSC before 0.20.0 has a double free in coolkey_free_private_data because coolkey_add_object in…
CVE-2018-16393 — Medium (CVSS 6.8): Several buffer overflows when handling responses from a Gemsafe V1 Smartcard in gemsafe_get_cert_len in…

All CVEs affecting Opensc Project Opensc →

Other CWE-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →