UBUNTU-CVE-2019-20840

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Source
https://ubuntu.com/security/CVE-2019-20840
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-20840.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2019-20840
Upstream
Downstream
Related
Published
2020-06-17T16:15:00Z
Modified
2025-10-10T14:59:38Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.

References

Affected packages

Ubuntu:16.04:LTS

libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver@0.9.10+dfsg-3ubuntu0.16.04.5?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.10+dfsg-3ubuntu0.16.04.5

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
0.9.10+dfsg-3ubuntu0.16.04.3
0.9.10+dfsg-3ubuntu0.16.04.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver-config"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver-dev"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver1"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:18.04:LTS

libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver@0.9.11+dfsg-1ubuntu1.3?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.11+dfsg-1ubuntu1.3

Affected versions

0.*

0.9.11+dfsg-1
0.9.11+dfsg-1ubuntu1
0.9.11+dfsg-1ubuntu1.1
0.9.11+dfsg-1ubuntu1.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncserver-config"
        },
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncserver-dev"
        },
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncserver1"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:22.04:LTS

veyon

Package

Name
veyon
Purl
pkg:deb/ubuntu/veyon@4.5.3+repack1-1build2?arch=source&distro=jammy

Affected ranges

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

Affected versions

4.*

4.5.3+repack1-1build1
4.5.3+repack1-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.5.3+repack1-1build2",
            "binary_name": "libveyon-core"
        },
        {
            "binary_version": "4.5.3+repack1-1build2",
            "binary_name": "veyon-configurator"
        },
        {
            "binary_version": "4.5.3+repack1-1build2",
            "binary_name": "veyon-master"
        },
        {
            "binary_version": "4.5.3+repack1-1build2",
            "binary_name": "veyon-plugins"
        },
        {
            "binary_version": "4.5.3+repack1-1build2",
            "binary_name": "veyon-service"
        }
    ]
}

Ubuntu:24.04:LTS

veyon

Package

Name
veyon
Purl
pkg:deb/ubuntu/veyon@4.7.5+repack1-1ubuntu5?arch=source&distro=noble

Affected ranges

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

Affected versions

4.*

4.7.5+repack1-1build2
4.7.5+repack1-1ubuntu1
4.7.5+repack1-1ubuntu3
4.7.5+repack1-1ubuntu4
4.7.5+repack1-1ubuntu5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.7.5+repack1-1ubuntu5",
            "binary_name": "libveyon-core"
        },
        {
            "binary_version": "4.7.5+repack1-1ubuntu5",
            "binary_name": "veyon-configurator"
        },
        {
            "binary_version": "4.7.5+repack1-1ubuntu5",
            "binary_name": "veyon-master"
        },
        {
            "binary_version": "4.7.5+repack1-1ubuntu5",
            "binary_name": "veyon-plugins"
        },
        {
            "binary_version": "4.7.5+repack1-1ubuntu5",
            "binary_name": "veyon-service"
        }
    ]
}

Ubuntu:25.04

veyon

Package

Name
veyon
Purl
pkg:deb/ubuntu/veyon@4.7.5+repack1-1ubuntu6?arch=source&distro=plucky

Affected ranges

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

Affected versions

4.*

4.7.5+repack1-1ubuntu6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.7.5+repack1-1ubuntu6",
            "binary_name": "libveyon-core"
        },
        {
            "binary_version": "4.7.5+repack1-1ubuntu6",
            "binary_name": "veyon-configurator"
        },
        {
            "binary_version": "4.7.5+repack1-1ubuntu6",
            "binary_name": "veyon-master"
        },
        {
            "binary_version": "4.7.5+repack1-1ubuntu6",
            "binary_name": "veyon-plugins"
        },
        {
            "binary_version": "4.7.5+repack1-1ubuntu6",
            "binary_name": "veyon-service"
        }
    ]
}

Ubuntu:25.10

veyon

Package

Name
veyon
Purl
pkg:deb/ubuntu/veyon@4.9.7+repack1-1?arch=source&distro=questing

Affected ranges

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

Affected versions

4.*

4.7.5+repack1-1ubuntu6
4.7.5+repack1-1ubuntu7
4.9.7+repack1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.9.7+repack1-1",
            "binary_name": "libveyon-core"
        },
        {
            "binary_version": "4.9.7+repack1-1",
            "binary_name": "veyon-configurator"
        },
        {
            "binary_version": "4.9.7+repack1-1",
            "binary_name": "veyon-master"
        },
        {
            "binary_version": "4.9.7+repack1-1",
            "binary_name": "veyon-plugins"
        },
        {
            "binary_version": "4.9.7+repack1-1",
            "binary_name": "veyon-service"
        }
    ]
}

Ubuntu:Pro:14.04:LTS

x11vnc

Package

Name
x11vnc
Purl
pkg:deb/ubuntu/x11vnc@0.9.13-1.1?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

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

Affected versions

0.*

0.9.13-1.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.13-1.1",
            "binary_name": "x11vnc"
        },
        {
            "binary_version": "0.9.13-1.1",
            "binary_name": "x11vnc-data"
        }
    ]
}

Ubuntu:Pro:20.04:LTS

veyon

Package

Name
veyon
Purl
pkg:deb/ubuntu/veyon@4.3.1+repack1-2build2?arch=source&distro=esm-apps/focal

Affected ranges

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

Affected versions

4.*

4.2.4+repack1-2
4.2.5+repack1-1
4.3.1+repack1-1
4.3.1+repack1-2
4.3.1+repack1-2build1
4.3.1+repack1-2build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.3.1+repack1-2build2",
            "binary_name": "libveyon-core"
        },
        {
            "binary_version": "4.3.1+repack1-2build2",
            "binary_name": "veyon-configurator"
        },
        {
            "binary_version": "4.3.1+repack1-2build2",
            "binary_name": "veyon-master"
        },
        {
            "binary_version": "4.3.1+repack1-2build2",
            "binary_name": "veyon-plugins"
        },
        {
            "binary_version": "4.3.1+repack1-2build2",
            "binary_name": "veyon-service"
        }
    ]
}