Is CVE-2021-42782 in the CISA KEV catalog?

No. CVE-2021-42782 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-42782?

CVE-2021-42782 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-42782?

CVE-2021-42782 has an EPSS score of 2.67% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-42782?

Upgrade opensc on debian 11 to 0.21.0-1+deb11u1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-42782

MEDIUMEPSS 84th pctl

5.3

CVSS v3

NVD

Description

Stack buffer overflow issues were found in Opensc before version 0.22.0 in various places that could potentially crash programs using the library.

CWE-119Buffer Overflow CWE-787Out-of-bounds Write

How to fix

Remediation Available

openscDebian

Fixed in:0.21.0-1+deb11u1CVE-2021-42782

Fixed in:0.22.0-1CVE-2021-42782

openscUbuntu

Fixed in:0.15.0-1ubuntu1+esm2USN-7346-1

Fixed in:0.17.0-3ubuntu0.1~esm2USN-7346-1

Fixed in:0.20.0-3ubuntu0.1~esm4USN-7346-3

Fixed in:0.20.0-3ubuntu0.1~esm2USN-7346-1

Fixed in:0.22.0-1ubuntu2+esm1USN-7346-1

Fixed in:0.25.0~rc1-1ubuntu0.1~esm1USN-7346-1

opensc-pkcs11Ubuntu

Fixed in:0.15.0-1ubuntu1+esm2USN-7346-1

Fixed in:0.17.0-3ubuntu0.1~esm2USN-7346-1

Fixed in:0.20.0-3ubuntu0.1~esm4USN-7346-3

Fixed in:0.20.0-3ubuntu0.1~esm2USN-7346-1

Fixed in:0.22.0-1ubuntu2+esm1USN-7346-1

Fixed in:0.25.0~rc1-1ubuntu0.1~esm1USN-7346-1

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

AvailabilityLow

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

Exploit Intelligence

2.67%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch6

Third-Party Advisory1

security.gentoo.org

Other references2

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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.