CVE-2021-42778

MEDIUMNVD 5.35.3—

5.3

A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.

CVSS v3: 5.3
EG Score: 5.3(medium)
EPSS: 32.1%
KEV: Not listed

Published

April 18, 2022

Last Modified

November 3, 2025

References (9)

secalert@redhathttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28185
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=2016083
secalert@redhathttps://github.com/OpenSC/OpenSC/commit/f015746d
secalert@redhathttps://security.gentoo.org/glsa/202209-03
af854a3a-2127-422b-91ae-364da2661108https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28185
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=2016083
af854a3a-2127-422b-91ae-364da2661108https://github.com/OpenSC/OpenSC/commit/f015746d
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

Weakness Classification(2)

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

All Vendor Advisories

(1)

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.

Microsoft MSRCCVE-2021-427782022-04-26
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.

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
2026-05-23 08:51 UTCEG score recompute
2026-05-23 08:51 UTCVendor advisory

Frequently asked(5)

What is CVE-2021-42778?

CVE-2021-42778 is a medium vulnerability published on April 18, 2022. A heap double free issue was found in Opensc before version 0.22.0 in scpkcs15free_tokeninfo.

When was CVE-2021-42778 disclosed?

CVE-2021-42778 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-2021-42778 actively exploited?

CVE-2021-42778 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42778?

CVE-2021-42778 has a CVSS v3 base score of 5.3 (NVD).

How do I remediate CVE-2021-42778?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42778, 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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CVE-2021-42778

Published

Last Modified

References (9)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-42778?

Same vendor

Same CWE

CVE-2021-42778

📅 Published

🔄 Last Modified

🔗 References (9)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-42778?

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References (9)

Frequently asked(5)

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