X Server Unauthenticated Access: Screenshot

critical Nessus Plugin ID 66349
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 X server accepts TCP connections.


The remote X server accepts remote TCP connections. It is possible for an attacker to grab a screenshot of the remote host.


Restrict access to this port by using the 'xhost' command. If the X client/server facility is not used, disable TCP connections to the X server entirely.

Plugin Details

Severity: Critical

ID: 66349

File Name: xserver_screenshot.nbin

Version: 1.54

Type: remote

Family: Misc.

Published: 5/8/2013

Updated: 7/12/2021

Dependencies: X.nasl, os_fingerprint.nasl

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:x.org:x11:7.1_1.1.0

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 1/1/1990

Exploitable With

Metasploit (X11 No-Auth Scanner)

Reference Information

CVE: CVE-1999-0526

CERT: 704969