CVE-2021-34193

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

7.5 HighFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.39%Up 1.3 points since Aug 25, 2023

What each source reports

NVD Score used 7.5

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

Record: CVE-2021-34193
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-787
Updated: 2026-11-02

CVE List No score

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

Record: CVE-2021-34193
Updated: 2026-11-02

EUVDEUVD-2021-20855 No score

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

Record: EUVD-2021-20855
Updated: 2026-11-02

GitHub AdvisoriesGHSA-882v-v6g5-f7qr 7.5

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

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

Record: GHSA-882v-v6g5-f7qr
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-787
Updated: 2026-11-02

OSVAZL-28094 7.5

CVE-2021-34193 affecting package opensc for versions less than 0.23.0-1

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

Record: AZL-28094
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSV 7.5

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

Record: CVE-2021-34193
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-34193 7.5

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

Record: DEBIAN-CVE-2021-34193
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

opensc project opensc

Affected packages

Affected packages
Package	Affected	Fixed
`opensc` Azure Linux:2	before 0.23.0-1	0.23.0-1
`opensc` Debian:12	before 0.22.0-1	0.22.0-1
`opensc` Debian:13	before 0.22.0-1	0.22.0-1
`opensc` Debian:14	before 0.22.0-1	0.22.0-1
`opensc` Debian:11 From an advisory covering 18 CVEs	before 0.21.0-1+deb11u1, plus listed versions 0.21.0-1	0.21.0-1+deb11u1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-34193 is a high vulnerability (CVSS 7.5) in Opensc Project Opensc, published August 22, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.39%, the 72nd percentile. Fixed in opensc 0.23.0-1.

References

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