Debian DSA-4221-1 : libvncserver - security update

critical Nessus Plugin ID 110420
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote Debian host is missing a security-related update.


Alexander Peslyak discovered that insufficient input sanitising of RFB packets in LibVNCServer could result in the disclosure of memory contents.


Upgrade the libvncserver packages.

For the oldstable distribution (jessie), this problem has been fixed in version 0.9.9+dfsg2-6.1+deb8u3.

For the stable distribution (stretch), this problem has been fixed in version 0.9.11+dfsg-1+deb9u1.

See Also

Plugin Details

Severity: Critical

ID: 110420

File Name: debian_DSA-4221.nasl

Version: 1.3

Type: local

Agent: unix

Published: 6/11/2018

Updated: 11/13/2018

Dependencies: ssh_get_info.nasl

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

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


Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libvncserver, cpe:/o:debian:debian_linux:8.0, cpe:/o:debian:debian_linux:9.0

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

Patch Publication Date: 6/8/2018

Reference Information

CVE: CVE-2018-7225

DSA: 4221