CVE-2021-42780

MEDIUMNVD 5.35.3—

5.3

A use after return issue was found in Opensc before version 0.22.0 in insert_pin function that could potentially crash programs using the library.

CVSS v3: 5.3
EG Score: 5.3(medium)
EPSS: 24.6%
KEV: Not listed

Published

April 18, 2022

Last Modified

November 3, 2025

References (11)

secalert@redhathttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28383
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2016139
secalert@redhathttps://github.com/OpenSC/OpenSC/commit/5df913b7
secalert@redhathttps://lists.debian.org/debian-lts-announce/2023/06/msg00025.html
secalert@redhathttps://security.gentoo.org/glsa/202209-03
af854a3a-2127-422b-91ae-364da2661108https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28383
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2016139
af854a3a-2127-422b-91ae-364da2661108https://github.com/OpenSC/OpenSC/commit/5df913b7
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/06/msg00025.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/12/msg00026.html
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202209-03

Patch Availability(2)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	opensc-pkcs11 (0.15.0-1ubuntu1+esm2) @ xenial	2026-05-25	ubuntu
ubuntu	opensc-pkcs11 (0.20.0-3ubuntu0.1~esm4) @ focal	2026-05-25	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-252Unchecked Return Value

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 23:33 UTCEG score recompute
2026-05-25 23:33 UTCVendor advisory

Frequently asked(5)

What is CVE-2021-42780?

CVE-2021-42780 is a medium vulnerability published on April 18, 2022. A use after return issue was found in Opensc before version 0.22.0 in insert_pin function that could potentially crash programs using the library.

When was CVE-2021-42780 disclosed?

CVE-2021-42780 was first published in the National Vulnerability Database on April 18, 2022, with the most recent update on November 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-42780 actively exploited?

CVE-2021-42780 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42780?

CVE-2021-42780 has a CVSS v3 base score of 5.3 (NVD).

How do I remediate CVE-2021-42780?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42780, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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