CVE-2021-42779

Name: CVE-2021-42779
Creator: NVD / NIST
Published: 2022-04-18T17:15:16.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.94%

Last modified Jun 17, 2026

CVE-2021-42779 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A heap use after free issue was found in Opensc before version 0.22.0 in sc_file_valid.. EPSS estimates a 1.94% chance of exploitation in the next 30 days.

Description

A heap use after free issue was found in Opensc before version 0.22.0 in sc_file_valid.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.94%

77.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Opensc Project	Opensc	< 0.22.0
Fedoraproject	Fedora	33
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28843Issue Tracking, Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2016086Issue Tracking, Patch, Third Party Advisory
https://github.com/OpenSC/OpenSC/commit/1db88374Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00025.html
https://security.gentoo.org/glsa/202209-03Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28843Issue Tracking, Mailing List, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2016086Issue Tracking, Patch, Third Party Advisory
https://github.com/OpenSC/OpenSC/commit/1db88374Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00025.html
https://lists.debian.org/debian-lts-announce/2024/12/msg00026.html
https://security.gentoo.org/glsa/202209-03Third Party Advisory

Timeline

Published: Apr 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42779?

A heap use after free issue was found in Opensc before version 0.22.0 in sc_file_valid.

How severe is CVE-2021-42779?

CVE-2021-42779 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.94% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42779?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42779?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST