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Fencer Intel
medium 5.3

CVE-2021-42782 json

Stack buffer overflow issues were found in Opensc before version 0.22.0 in various places that could potentially crash programs using the l…

published 4y ago modified 4mo ago also EUVD-2021-29738

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

Stack buffer overflow issues were found in Opensc before version 0.22.0 in various places that could potentially crash programs using the library.

Patch / fix

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

debian advisories DEBIAN-CVE-2021-42782

  • opensc Ubuntu Pro 20.04 LTS 0.20.0-3ubuntu0.1~esm4

ubuntu advisories UBUNTU-CVE-2021-42782

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • opensc SLES for SAP 12 SP5, SLES 12 SP5 0.13.0-3.25.1
  • opensc SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +7 more 0.19.0-150100.3.16.1
  • opensc SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 0.18.0-150000.3.23.1
  • opensc SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 0.11.6-5.27.14.1
  • opensc SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +10 more 0.13.0-3.19.1

suse advisories SUSE-SU-2023:4065-1SUSE-SU-2022:1156-1SUSE-SU-2022:1041-1SUSE-SU-2021:14835-1SUSE-SU-2021:3582-1

  • opensc openSUSE Tumbleweed 0.22.0-1.1

opensuse advisories openSUSE-SU-2024:11613-1

  • opensc CBL-Mariner 2.0 0.22.0-1

azure linux advisories AZL-9485

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

Is CVE-2021-42782 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2021-42782 updated cvss 5.3

opensc: Stack buffer overflow issues in various places

  • Red Hat Enterprise Linux 7 opensc
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 opensc
    affected: workaround, 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

2.78% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

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-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write

References

Sources

Fencer Intel 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.