How severe is CVE-2020-26571?

CVE-2020-26571 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-26571 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26571?

CVE-2020-26571 primarily affects Opensc Project Opensc. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-26571?

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

When was CVE-2020-26571 published?

CVE-2020-26571 was published on 2020-10-06 and last updated on 2026-06-17.

CVE-2020-26571

CVE-2020-26571 is a medium-severity vulnerability in Opensc Project Opensc with a CVSS 3.x base score of 5.5. 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-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Opensc Project Opensc
Published: 2020-10-06
Last modified: 2026-06-17

Description

The gemsafe GPK smart card software driver in OpenSC before 0.21.0-rc1 has a stack-based buffer overflow in sc_pkcs15emu_gemsafeGPK_init.

Frequently asked questions

What is CVE-2020-26571?: The gemsafe GPK smart card software driver in OpenSC before 0.21.0-rc1 has a stack-based buffer overflow in sc_pkcs15emu_gemsafeGPK_init.
How severe is CVE-2020-26571?: CVE-2020-26571 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-26571 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-26571?: CVE-2020-26571 primarily affects Opensc Project Opensc. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-26571?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-26571 published?: CVE-2020-26571 was published on 2020-10-06 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

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…

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