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Fencer Intel
medium 6.6

CVE-2018-16421 json

Several buffer overflows when handling responses from a CAC Card in cac_get_serial_nr_from_CUID in libopensc/card-cac.c in OpenSC before 0.…

published 8y ago modified 4mo ago also EUVD-2018-8261

cvss
6.6
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

Several buffer overflows when handling responses from a CAC Card in cac_get_serial_nr_from_CUID in libopensc/card-cac.c in OpenSC before 0.19.0-rc1 could be used by attackers able to supply crafted smartcards to cause a denial of service (application crash) or possibly have unspecified other impact.

Patch / fix

  • opensc Debian 14, Debian 13, Debian 12 0.19.0~rc1-1

debian advisories DEBIAN-CVE-2018-16421

  • opensc RHEL 7 0.19.0-3.el7

red hat advisories RHSA-2019:2154

  • opensc SLE Module for Basesystem 15 0.18.0-3.8.1

suse advisories SUSE-SU-2018:3629-1

  • opensc openSUSE Tumbleweed 0.21.0-2.2

opensuse advisories openSUSE-SU-2024:11123-1

  • opensc Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 0.19.0-r0

alpine advisories ALPINE-CVE-2018-16421

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2018-16421 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-2018-16421 updated cvss 4.3

opensc: Buffer overflows handling responses from CAC Cards in card-cac.c:cac_get_serial_nr_from_CUID()

  • Red Hat Enterprise Linux Client (v. 7) opensc 0.19.0-3.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) opensc 0.19.0-3.el7 Red Hat Enterprise Linux Server (v. 7) opensc 0.19.0-3.el7 Red Hat Enterprise Linux Workstation (v. 7) opensc 0.19.0-3.el7
    fixed: vendor fix RHSA-2019:2154
  • Red Hat Enterprise Linux 8 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

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • x41-dsec.de https://www.x41-dsec.de/lab/advisories/x41-2018-002-OpenSC/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 6.6 CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.