CVE catalog

CVE-2020-14396

libvncserver affected and fixed versions

[CVE catalog]

An issue was discovered in LibVNCServer before 0.9.13. libvncclient/tls_openssl.c has a NULL pointer dereference.

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jun 17, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.57% · Oct 27, 2026

Projects and upstream resources

[libvncserver][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	libvncserver	`0.9.13+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2020-14396]
Debiantrixie	libvncserver	`0.9.15+dfsg-1+deb13u2`	Fixed	[CVE-2020-14396]
Debiansid	libvncserver	`0.9.13+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2020-14396]
Debiansid	libvncserver	`0.9.15+dfsg-6`	Fixed	[CVE-2020-14396]
Debianforky	libvncserver	`0.9.13+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2020-14396]
Debianforky	libvncserver	`0.9.15+dfsg-6`	Fixed	[CVE-2020-14396]
Debianbookworm	libvncserver	`0.9.13+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2020-14396]
Debianbookworm	libvncserver	`0.9.14+dfsg-1+deb12u2`	Fixed	[CVE-2020-14396]

Showing 8 fix observations. All 9 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	libvncserver	`0.9.13+dfsg-1`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	libvncserver	`0.9.13+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2020-14396]
Debianbookworm	libvncserver	`0.9.14+dfsg-1+deb12u2`	Fixed	[CVE-2020-14396]
Debianforky	libvncserver	`0.9.13+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2020-14396]
Debianforky	libvncserver	`0.9.15+dfsg-6`	Fixed	[CVE-2020-14396]
Debiansid	libvncserver	`0.9.13+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2020-14396]
Debiansid	libvncserver	`0.9.15+dfsg-6`	Fixed	[CVE-2020-14396]
Debiantrixie	libvncserver	`0.9.13+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2020-14396]
Debiantrixie	libvncserver	`0.9.15+dfsg-1+deb13u2`	Fixed	[CVE-2020-14396]

Original provider fields

{
  "package_releases": [
    {
      "name": "libvncserver",
      "status": "fixed",
      "release": "sid",
      "version": "0.9.15+dfsg-6"
    },
    {
      "name": "libvncserver",
      "status": "fixed",
      "release": "forky",
      "version": "0.9.15+dfsg-6"
    },
    {
      "name": "libvncserver",
      "status": "fixed",
      "release": "trixie",
      "version": "0.9.15+dfsg-1+deb13u2"
    },
    {
      "name": "libvncserver",
      "status": "fixed",
      "release": "bookworm",
      "version": "0.9.14+dfsg-1+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "libvncserver",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "0.9.13+dfsg-1"
    },
    {
      "bug": null,
      "name": "libvncserver",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "0.9.13+dfsg-1"
    },
    {
      "bug": null,
      "name": "libvncserver",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "0.9.13+dfsg-1"
    },
    {
      "bug": null,
      "name": "libvncserver",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "0.9.13+dfsg-1"
    }
  ],
  "distribution_packages": [
    {
      "name": "libvncserver",
      "fixed_version": "0.9.13+dfsg-1",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libvncclient1]Unknown
Source package: [libvncserver]
Details (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
[libvncserver1]Unknown
Source package: [libvncserver]
Details (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
[libvncserver-dev]Unknown
Source package: [libvncserver]
Details (2)
- 0.9.14+dfsg-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12
- 0.9.14+dfsg-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · bookworm; dsa · libvncserver · debian · 12

[Debian 13 (Trixie)]

[libvncclient1]Unknown
Source package: [libvncserver]
Details (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · 13
[libvncserver1]Unknown
Source package: [libvncserver]
Details (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · 13
[libvncserver-dev]Unknown
Source package: [libvncserver]
Details (2)
- 0.9.15+dfsg-1+deb13u2 · amd64 · trixie
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · 13
- 0.9.15+dfsg-1+deb13u2 · arm64 · trixie
  Fixed · Fixed: 0.9.13+dfsg-1
  dsa · libvncserver · debian · 13

Observed: Oct 23, 2026, 5:48:02 PM UTC

References

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