What’s Vulnerable › Vulnerabilities

CVE-2021-42781

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-04-18 · updated 2026-06-17
• Weakness: CWE-119

Description

Heap buffer overflow issues were found in Opensc before version 0.22.0 in pkcs15-oberthur.c that could potentially crash programs using the library.

Affected products

• Fedoraproject Fedora: 33
• OpenSC: before 0.22.0 — fixed in 0.22.0
• Red Hat Enterprise Linux: 7.0

How to fix

Upgrade to a fixed version: OpenSC 0.22.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=2016439
• https://github.com/OpenSC/OpenSC/commit/05648b06
• https://github.com/OpenSC/OpenSC/commit/17d8980c
• https://github.com/OpenSC/OpenSC/commit/40c50a3a
• https://github.com/OpenSC/OpenSC/commit/5d4daf6c
• https://github.com/OpenSC/OpenSC/commit/cae5c71f
• https://lists.debian.org/debian-lts-announce/2023/06/msg00025.html
• https://security.gentoo.org/glsa/202209-03
• https://bugzilla.redhat.com/show_bug.cgi?id=2016439
• https://github.com/OpenSC/OpenSC/commit/05648b06
• https://github.com/OpenSC/OpenSC/commit/17d8980c
• https://github.com/OpenSC/OpenSC/commit/40c50a3a

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