Debian DLA-2451-1 : libvncserver security update

high Nessus Plugin ID 142924


The remote Debian host is missing a security update.


An issue has been found in libvncserver, an API to write one's own VNC server. Due to some missing checks, a divide by zero could happen, which could result in a denial of service.

For Debian 9 stretch, this problem has been fixed in version 0.9.11+dfsg-1.3~deb9u6.

We recommend that you upgrade your libvncserver packages.

For the detailed security status of libvncserver please refer to its security tracker page at:

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Upgrade the affected packages.

See Also

Plugin Details

Severity: High

ID: 142924

File Name: debian_DLA-2451.nasl

Version: 1.4

Type: local

Agent: unix

Published: 11/17/2020

Updated: 2/8/2024

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information


Risk Factor: Medium

Score: 4.4


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2020-25708


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libvncclient1, p-cpe:/a:debian:debian_linux:libvncclient1-dbg, p-cpe:/a:debian:debian_linux:libvncserver-config, p-cpe:/a:debian:debian_linux:libvncserver-dev, p-cpe:/a:debian:debian_linux:libvncserver1, p-cpe:/a:debian:debian_linux:libvncserver1-dbg, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/15/2020

Vulnerability Publication Date: 11/27/2020

Reference Information

CVE: CVE-2020-25708