UBUNTU-CVE-2018-20021

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Source
https://ubuntu.com/security/CVE-2018-20021
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20021.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2018-20021
Upstream
Downstream
Related
Published
2018-12-19T00:00:00Z
Modified
2025-10-24T04:47:17Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

LibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM

References

Affected packages

Ubuntu:14.04:LTS

libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver@0.9.9+dfsg-1ubuntu1.4?arch=source&distro=trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.9+dfsg-1ubuntu1.4

Affected versions

0.*

0.9.9+dfsg-1
0.9.9+dfsg-1ubuntu1
0.9.9+dfsg-1ubuntu1.1
0.9.9+dfsg-1ubuntu1.2
0.9.9+dfsg-1ubuntu1.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libvncserver-config",
            "binary_version": "0.9.9+dfsg-1ubuntu1.4"
        },
        {
            "binary_name": "libvncserver-dev",
            "binary_version": "0.9.9+dfsg-1ubuntu1.4"
        },
        {
            "binary_name": "libvncserver0",
            "binary_version": "0.9.9+dfsg-1ubuntu1.4"
        },
        {
            "binary_name": "linuxvnc",
            "binary_version": "0.9.9+dfsg-1ubuntu1.4"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:16.04:LTS

italc

Package

Name
italc
Purl
pkg:deb/ubuntu/italc@1:2.0.2+dfsg1-4ubuntu0.1?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.0.2+dfsg1-4ubuntu0.1

Affected versions

1:2.*

1:2.0.2+dfsg1-3
1:2.0.2+dfsg1-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "italc-client",
            "binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
        },
        {
            "binary_name": "italc-management-console",
            "binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
        },
        {
            "binary_name": "italc-master",
            "binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
        },
        {
            "binary_name": "libitalccore",
            "binary_version": "1:2.0.2+dfsg1-4ubuntu0.1"
        }
    ],
    "availability": "No subscription required"
}

libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver@0.9.10+dfsg-3ubuntu0.16.04.3?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.10+dfsg-3ubuntu0.16.04.3

Affected versions

0.*

0.9.10+dfsg-3
0.9.10+dfsg-3build1
0.9.10+dfsg-3ubuntu0.16.04.1
0.9.10+dfsg-3ubuntu0.16.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libvncclient1",
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.3"
        },
        {
            "binary_name": "libvncserver-config",
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.3"
        },
        {
            "binary_name": "libvncserver-dev",
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.3"
        },
        {
            "binary_name": "libvncserver1",
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.3"
        }
    ],
    "availability": "No subscription required"
}

ssvnc

Package

Name
ssvnc
Purl
pkg:deb/ubuntu/ssvnc@1.0.29-2+deb8u1build0.16.04.1?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.0.29-2+deb8u1build0.16.04.1

Affected versions

1.*

1.0.29-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ssvnc",
            "binary_version": "1.0.29-2+deb8u1build0.16.04.1"
        }
    ],
    "availability": "No subscription required"
}

tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc@1.3.10-0ubuntu3?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.3.10-0ubuntu2
1.3.10-0ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncserver",
            "binary_version": "1.3.10-0ubuntu3"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1.3.10-0ubuntu3"
        }
    ]
}

Ubuntu:18.04:LTS

italc

Package

Name
italc
Purl
pkg:deb/ubuntu/italc@1:3.0.3+dfsg1-3ubuntu0.1?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:3.0.3+dfsg1-3ubuntu0.1

Affected versions

1:3.*

1:3.0.3+dfsg1-1
1:3.0.3+dfsg1-2
1:3.0.3+dfsg1-2build1
1:3.0.3+dfsg1-2ubuntu1
1:3.0.3+dfsg1-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "italc-client",
            "binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
        },
        {
            "binary_name": "italc-management-console",
            "binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
        },
        {
            "binary_name": "italc-master",
            "binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
        },
        {
            "binary_name": "libitalccore",
            "binary_version": "1:3.0.3+dfsg1-3ubuntu0.1"
        }
    ],
    "availability": "No subscription required"
}

libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver@0.9.11+dfsg-1ubuntu1.1?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.11+dfsg-1ubuntu1.1

Affected versions

0.*

0.9.11+dfsg-1
0.9.11+dfsg-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libvncclient1",
            "binary_version": "0.9.11+dfsg-1ubuntu1.1"
        },
        {
            "binary_name": "libvncserver-config",
            "binary_version": "0.9.11+dfsg-1ubuntu1.1"
        },
        {
            "binary_name": "libvncserver-dev",
            "binary_version": "0.9.11+dfsg-1ubuntu1.1"
        },
        {
            "binary_name": "libvncserver1",
            "binary_version": "0.9.11+dfsg-1ubuntu1.1"
        }
    ],
    "availability": "No subscription required"
}

ssvnc

Package

Name
ssvnc
Purl
pkg:deb/ubuntu/ssvnc@1.0.29-3build1?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.0.29-3
1.0.29-3build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ssvnc",
            "binary_version": "1.0.29-3build1"
        }
    ]
}

tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc@1.3.10-0ubuntu4?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.3.10-0ubuntu3
1.3.10-0ubuntu4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncserver",
            "binary_version": "1.3.10-0ubuntu4"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1.3.10-0ubuntu4"
        }
    ]
}

Ubuntu:20.04:LTS

tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc@1.3.10-0ubuntu5?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.3.10-0ubuntu5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncserver",
            "binary_version": "1.3.10-0ubuntu5"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1.3.10-0ubuntu5"
        }
    ]
}

Ubuntu:22.04:LTS

tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc@1:1.3.10-5?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1:1.*

1:1.3.10-3
1:1.3.10-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncpasswd",
            "binary_version": "1:1.3.10-5"
        },
        {
            "binary_name": "tightvncserver",
            "binary_version": "1:1.3.10-5"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1:1.3.10-5"
        }
    ]
}

Ubuntu:24.04:LTS

tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc@1:1.3.10-8?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1:1.*

1:1.3.10-7
1:1.3.10-7build1
1:1.3.10-7build2
1:1.3.10-8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncpasswd",
            "binary_version": "1:1.3.10-8"
        },
        {
            "binary_name": "tightvncserver",
            "binary_version": "1:1.3.10-8"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1:1.3.10-8"
        }
    ]
}

Ubuntu:25.04

tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc@1:1.3.10-9?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1:1.*

1:1.3.10-9

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncpasswd",
            "binary_version": "1:1.3.10-9"
        },
        {
            "binary_name": "tightvncserver",
            "binary_version": "1:1.3.10-9"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1:1.3.10-9"
        }
    ]
}

Ubuntu:25.10

tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc@1:1.3.10-10?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1:1.*

1:1.3.10-9
1:1.3.10-10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncpasswd",
            "binary_version": "1:1.3.10-10"
        },
        {
            "binary_name": "tightvncserver",
            "binary_version": "1:1.3.10-10"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1:1.3.10-10"
        }
    ]
}

Ubuntu:Pro:14.04:LTS

tightvnc

Package

Name
tightvnc
Purl
pkg:deb/ubuntu/tightvnc@1.3.9-6.5+deb8u1build0.14.04.1~esm1?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.3.9-6.5+deb8u1build0.14.04.1~esm1

Affected versions

1.*

1.3.9-6.4
1.3.9-6.4ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "tightvncserver",
            "binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
        },
        {
            "binary_name": "xtightvncviewer",
            "binary_version": "1.3.9-6.5+deb8u1build0.14.04.1~esm1"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}