CVE-2021-42778

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2022-04-19. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
79.6%
KEV
Not listed

Published

April 18, 2022

Last Modified

November 3, 2025

References (9)

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.

Data Freshness Timeline

(refreshed 10× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 105 total refreshes for this CVE.

  1. 2026-07-22 14:06 UTCEPSS rescore
  2. 2026-07-21 15:22 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  18. 2026-07-13 04:37 UTCOSV refresh
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  1. 2026-07-06 16:25 UTCEPSS rescore
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  18. 2026-06-25 13:48 UTCEPSS rescore
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  20. 2026-06-24 15:01 UTCOSV refresh
  21. 2026-06-24 14:03 UTCEPSS rescore
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  25. 2026-06-21 14:55 UTCEPSS rescore
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  40. 2026-06-13 22:58 UTCEPSS rescore
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  42. 2026-06-12 23:10 UTCEPSS rescore
  43. 2026-06-11 13:58 UTCEPSS rescore
  44. 2026-06-11 13:58 UTCEPSS rescore
  45. 2026-06-10 22:16 UTCEPSS rescore
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  47. 2026-06-10 13:20 UTCEPSS rescore
  48. 2026-06-08 14:15 UTCEPSS rescore
  49. 2026-06-08 14:15 UTCEPSS rescore
  50. 2026-06-07 18:46 UTCOSV refresh
  51. 2026-06-07 15:23 UTCEPSS rescore
  52. 2026-06-07 15:23 UTCEPSS rescore
  53. 2026-06-06 13:46 UTCEPSS rescore
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  55. 2026-06-05 22:45 UTCEPSS rescore
  56. 2026-06-05 06:09 UTCEPSS rescore
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  66. 2026-05-31 00:15 UTCEPSS rescore
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  68. 2026-05-29 13:42 UTCEPSS rescore
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  73. 2026-05-26 13:42 UTCEPSS rescore
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  75. 2026-05-26 07:17 UTCEPSS rescore

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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 79.6% 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.

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