CVE-2021-34193

Name: CVE-2021-34193
Creator: NVD / NIST
Published: 2023-08-22T19:16:20.913+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.14%

Last modified Jun 17, 2026

CVE-2021-34193 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs.. EPSS estimates a 1.14% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.14%

62.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Opensc Project	Opensc	< 0.22.0

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27719Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28185Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28383Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28768Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28843Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28855Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29912Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30112Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30800Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31448Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31540Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32149Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27719Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28185Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28383Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28768Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28843Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28855Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29912Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30112Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30800Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31448Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31540Issue Tracking, Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32149Issue Tracking, Mailing List
https://lists.debian.org/debian-lts-announce/2024/12/msg00026.html

Timeline

Published: Aug 22, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34193?

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

How severe is CVE-2021-34193?

CVE-2021-34193 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34193?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34193?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST