What’s Vulnerable › Vulnerabilities

CVE-2021-34193

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-22 · updated 2026-06-17
• Weakness: CWE-787

Description

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

Affected products

• OpenSC: before 0.22.0 — fixed in 0.22.0

How to fix

Upgrade to a fixed version: OpenSC 0.22.0. Check the vendor advisory for mitigations.

References

• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27719
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28185
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28383
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28768
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28843
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28855
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29912
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30112
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30800
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31448
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31540
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32149

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