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    CVE-2021-34193

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

    Published:Aug 22, 2023
    Last Modified:Nov 3, 2025
    EPS:Aug 22, 2023
    EPSS Score:0.00411
    CVSS Score:7.5

    Affected Products

    Vendor
    Opensc Project
    Product
    Opensc

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-40528 (CVSS 1) — OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the d…
    CVE-2026-40510 (CVSS 1) — OpenSC before 0.27.0-rc1, fixed in commit 3f24f0b, contains a stack buffer overflow vulnerability in piv_proce…
    CVE-2025-66215 (CVSS 3.8) — OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with physical a…
    CVE-2025-66038 (CVSS 3.9) — OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag sear…
    CVE-2025-66037 (CVSS 3.9) — OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input to …
    CVE-2025-49010 (CVSS 3.8) — OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with physical a…
    CVE-2025-24531 (CVSS 6.7) — In OpenSC pam_pkcs11 before 0.6.13, pam_sm_authenticate() wrongly returns PAM_IGNORE in many error situations …
    CVE-2024-8443 (CVSS 2.9) — A heap-based buffer overflow vulnerability was found in the libopensc OpenPGP driver. A crafted USB device or …
    CVE-2024-45617 (CVSS 3.9) — A vulnerability was found in OpenSC, OpenSC tools, PKCS#11 module, minidriver, and CTK. An attacker could use …
    CVE-2024-45619 (CVSS 4.3) — A vulnerability was found in OpenSC, OpenSC tools, PKCS#11 module, minidriver, and CTK. An attacker could use …

    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
    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
    https://lists.debian.org/debian-lts-announce/2024/12/msg00026.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High