Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs.
Priority LOW 36CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs.
Why it matters now
EPSS 0.01389 72nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Not affected: 3 products
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34193
- 2026-10-03 Alias added: GHSA-882v-v6g5-f7qr
References
Other 12
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27719
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30800
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30112
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28768
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28855
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32149
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28185
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29912
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28843
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31540
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28383
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31448
More Opensc vulnerabilities
- TI-2025-40564 OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers CVSS 3.1MEDIUM 6.8
- TI-2025-40563 OpenSC: Out of Bounds vulnerability CVSS 3.1MEDIUM 6.8
- TI-2019-04558 sc_context_create in ctx.c in libopensc in OpenSC 0.19.0 has a memory leak, as demonstrated by a call from eidenv. CVSS 3.0HIGH 7.5
- TI-2019-12067 An issue was discovered in the pam_p11 component 0.2.0 and 0.3.0 for OpenSC. CVSS 3.0HIGH 7.5
- TI-2023-21453 Opensc: potential pin bypass when card tracks its own login state CVSS 3.1MEDIUM 6.6
- TI-2023-21454 Opensc: multiple memory issues with pkcs15-init (enrollment tool) CVSS 3.1MEDIUM 6.4
Sources
- CVE-2021-34193 · CVE Program
- CVE-2021-34193 · NVD
- FIRST EPSS
- GHSA-882v-v6g5-f7qr · GitHub Advisory Database · CC BY 4.0
- CVE-2021-34193 · Red Hat security data · CC BY 4.0
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