Is CVE-2021-34193 in the CISA KEV catalog?

No. CVE-2021-34193 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-34193?

CVE-2021-34193 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-34193?

CVE-2021-34193 has an EPSS score of 1.14% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-34193?

Upgrade opensc on debian 11 to 0.21.0-1+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-34193

HIGH

7.5

CVSS v3

NVD

Description

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

CWE-787Out-of-bounds Write

How to fix

Remediation Available

openscDebian

Fixed in:0.21.0-1+deb11u1CVE-2021-34193

Fixed in:0.22.0-1CVE-2021-34193

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.14%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Issue Tracking12

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.