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

published 2022-04-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-29734

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.1%; EPSS 2.1% chance of exploitation in 30 days, percentile 82%
public exploits: 0; none known

Patch / fix

fixed in 1 distros 2 links 3

opensc_project opensc 0.22.0

debian azure linux

opensc Debian 14, Debian 13, Debian 12 0.22.0-1

debian advisories DEBIAN-CVE-2021-42778

opensc CBL-Mariner 2.0 0.22.0-1

azure linux advisories AZL-9481

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

github.com/OpenSC/OpenSC@f015746 commit
bugs.chromium.org/p/oss-fuzz/issues/detail?id=28185 advisory
bugzilla.redhat.com/show_bug.cgi?id=2016083 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-42778 updated 2026-11-07 cvss 2.0

opensc: Heap double free in sc_pkcs15_free_tokeninfo

Red Hat Enterprise Linux 7 opensc
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux 8 opensc
affected: no fix available “Fix deferred”
Red Hat Enterprise Linux 9 opensc
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.14% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

n/a opensc

Classification

Weakness

CWE-672 Operation on a Resource after Expiration or Release
CWE-415 Double Free

References

github.com /OpenSC/OpenSC/commit/f015746d
patch, third-party-advisory
bugs.chromium.org /p/oss-fuzz/issues/detail?id=28185
issue-tracking, mailing-list, patch, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=2016083
issue-tracking, patch, third-party-advisory
security.gentoo.org /glsa/202209-03
vendor-advisory, third-party-advisory
lists.debian.org /debian-lts-announce/2024/12/msg00026.html

Sources

CVE List CVE-2021-42778
NVD CVE-2021-42778

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary