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No exploitation reportedFix available

CVE-2018-16421

No exploitation reported by the sources we read.

  • Published2018-09-04
  • WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2018-09-0400:29CVE publishedNVD

Versions per branch

NVD
Opensc project opensc
BranchAffectedFixed in
0.18≤ 0.18.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openscUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • openscUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • openscSUSE:Linux Enterprise Module for Basesystem 15all versions · fixed in 0.18.0-3.8.1
  • openscRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:0.19.0-3.el7and 1 other package
  • openscRed Hat:enterprise_linux:7::serverall versions · fixed in 0:0.19.0-3.el7and 1 other package
  • openscRed Hat:enterprise_linux:7::computenodeall versions · fixed in 0:0.19.0-3.el7and 1 other package
  • openscRed Hat:enterprise_linux:7::clientall versions · fixed in 0:0.19.0-3.el7and 1 other package
  • openscopenSUSE:Tumbleweedall versions · fixed in 0.21.0-2.2

22 more package ranges on OSV.dev

Vendor advisories

  • CVE-2018-16421 Red Hat Product Security28 products fixed

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

  • RHSA-2019:2154 Red Hat Product Security28 products fixed

    Red Hat Security Advisory: opensc security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2019:2154 · 28 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2018-09-04
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-h7qm-v38r-6f4c

Frequently asked questions

What is CVE-2018-16421?

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.

Is CVE-2018-16421 actively exploited?

Active exploitation of CVE-2018-16421 has not been confirmed. Its EPSS score was 0.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-16421?

CVE-2018-16421 has a CVSS v3 base score of 6.6 (MEDIUM severity), with vector string CVSS:3.0/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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