Cyber Resilience

CVE-2021-34193

High

Published: 22 August 2023

Published
22 August 2023
Modified
03 November 2025
KEV Added
—
Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0065 71.3th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-34193 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Opensc Project Opensc. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 28.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs.

CWE(s)
CWE-787

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

opensc project
opensc
≤ 0.22.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-787

Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.

References