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Ubuntu 20.04 LTS : x11vnc vulnerability (USN-9089-1)

high Nessus Plugin ID 381348

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 20.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-9089-1 advisory.

 It was discovered that x11vnc created shared memory segments with insecure permissions. A local attacker could possibly use this issue to obtain sensitive information or modify screen contents.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected x11vnc package.

See Also

https://ubuntu.com/security/notices/USN-9089-1

Plugin Details

Severity: High

ID: 381348

File Name: ubuntu_USN-9089-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/14/2026

Updated: 11/14/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.51

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

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

CVSS Score Source: CVE-2020-29074

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:x11vnc

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/12/2026

Vulnerability Publication Date: 11/25/2020

Reference Information

CVE: CVE-2020-29074

USN: 9089-1