CVE catalog

CVE-2018-16421

opensc affected and fixed versions

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.

Severity: Medium · CVSS 4.3CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published: Sep 4, 2018, 12:29:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.72% · Oct 27, 2026

Projects and upstream resources

[opensc][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie	opensc	`0.19.0~rc1-1`	FixedDistribution-reported fixed boundary	[CVE-2018-16421]
Debiantrixie	opensc	`0.26.1-2`	Fixed	[CVE-2018-16421]
Debiansid	opensc	`0.19.0~rc1-1`	FixedDistribution-reported fixed boundary	[CVE-2018-16421]
Debiansid	opensc	`0.27.1-3`	Fixed	[CVE-2018-16421]
Debianforky	opensc	`0.19.0~rc1-1`	FixedDistribution-reported fixed boundary	[CVE-2018-16421]
Debianforky	opensc	`0.27.1-3`	Fixed	[CVE-2018-16421]
Debianbookworm	opensc	`0.19.0~rc1-1`	FixedDistribution-reported fixed boundary	[CVE-2018-16421]
Debianbookworm	opensc	`0.23.0-0.3+deb12u2`	Fixed	[CVE-2018-16421]

Showing 8 fix observations. All 16 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	opensc	`0.19.0~rc1-1`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	opensc	`0.19.0~rc1-1`	FixedDistribution-reported fixed boundary	[CVE-2018-16421]
Debianbookworm	opensc	`0.23.0-0.3+deb12u2`	Fixed	[CVE-2018-16421]
Debianforky	opensc	`0.19.0~rc1-1`	FixedDistribution-reported fixed boundary	[CVE-2018-16421]
Debianforky	opensc	`0.27.1-3`	Fixed	[CVE-2018-16421]
Debiansid	opensc	`0.19.0~rc1-1`	FixedDistribution-reported fixed boundary	[CVE-2018-16421]
Debiansid	opensc	`0.27.1-3`	Fixed	[CVE-2018-16421]
Debiantrixie	opensc	`0.19.0~rc1-1`	FixedDistribution-reported fixed boundary	[CVE-2018-16421]
Debiantrixie	opensc	`0.26.1-2`	Fixed	[CVE-2018-16421]
Ubuntupro	opensc	`0.17.0-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-16421]Sep 8, 2025, 4:45:00 PM UTC
Ubuntupro	opensc	`0.17.0-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-16421]Sep 8, 2025, 4:45:00 PM UTC
Ubuntupro	opensc	`0.17.0-2build1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-16421]Sep 8, 2025, 4:45:00 PM UTC
Ubuntupro	opensc	`0.17.0-3`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-16421]Sep 8, 2025, 4:45:00 PM UTC
Ubuntupro	opensc	`0.17.0-3ubuntu0.1~esm1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-16421]Sep 8, 2025, 4:45:00 PM UTC
Ubuntupro	opensc	`0.17.0-3ubuntu0.1~esm2`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-16421]Sep 8, 2025, 4:45:00 PM UTC
Ubuntupro	opensc	`0.17.0-3ubuntu0.1~esm3`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-16421]Sep 8, 2025, 4:45:00 PM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "opensc",
      "status": "fixed",
      "release": "sid",
      "version": "0.27.1-3"
    },
    {
      "name": "opensc",
      "status": "fixed",
      "release": "forky",
      "version": "0.27.1-3"
    },
    {
      "name": "opensc",
      "status": "fixed",
      "release": "trixie",
      "version": "0.26.1-2"
    },
    {
      "name": "opensc",
      "status": "fixed",
      "release": "bookworm",
      "version": "0.23.0-0.3+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 909444,
      "name": "opensc",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "low",
      "fixed_version": "0.19.0~rc1-1"
    },
    {
      "bug": 909444,
      "name": "opensc",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "low",
      "fixed_version": "0.19.0~rc1-1"
    },
    {
      "bug": 909444,
      "name": "opensc",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "low",
      "fixed_version": "0.19.0~rc1-1"
    },
    {
      "bug": 909444,
      "name": "opensc",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "low",
      "fixed_version": "0.19.0~rc1-1"
    }
  ],
  "distribution_packages": [
    {
      "name": "opensc",
      "fixed_version": "0.19.0~rc1-1",
      "applicability_unknown": true
    },
    {
      "name": "opensc",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "0.17.0-1",
        "0.17.0-2",
        "0.17.0-2build1",
        "0.17.0-3",
        "0.17.0-3ubuntu0.1~esm1",
        "0.17.0-3ubuntu0.1~esm2",
        "0.17.0-3ubuntu0.1~esm3"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2018-16421",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2018-16421",
      "provider_updated_at": "2025-09-08T16:45:00Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #909444]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[opensc]Unknown
Details (2)
- 0.23.0-0.3+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.19.0~rc1-1
  dsa · opensc · debian · bookworm; dsa · opensc · debian · 12
- 0.23.0-0.3+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.19.0~rc1-1
  dsa · opensc · debian · bookworm; dsa · opensc · debian · 12
[opensc-pkcs11]Unknown
Source package: [opensc]
Details (2)
- 0.23.0-0.3+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.19.0~rc1-1
  dsa · opensc · debian · bookworm; dsa · opensc · debian · 12
- 0.23.0-0.3+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.19.0~rc1-1
  dsa · opensc · debian · bookworm; dsa · opensc · debian · 12

[Debian 13 (Trixie)]

[opensc]Unknown
Details (2)
- 0.26.1-2 · amd64 · trixie
  Fixed · Fixed: 0.19.0~rc1-1
  dsa · opensc · debian · 13
- 0.26.1-2 · arm64 · trixie
  Fixed · Fixed: 0.19.0~rc1-1
  dsa · opensc · debian · 13
[opensc-pkcs11]Unknown
Source package: [opensc]
Details (2)
- 0.26.1-2 · amd64 · trixie
  Fixed · Fixed: 0.19.0~rc1-1
  dsa · opensc · debian · 13
- 0.26.1-2 · arm64 · trixie
  Fixed · Fixed: 0.19.0~rc1-1
  dsa · opensc · debian · 13

Observed: Oct 23, 2026, 5:35:04 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]