Piriform CCleaner 5.33.6162 Backdoor

critical Nessus Plugin ID 103302
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A system maintenance application installed on the remote host is affected by a malicious backdoor.


The version of Piriform CCleaner installed on the remote Windows host is equal to 5.33.6162. It is, therefore, affected by a malicious backdoor in CCleaner.exe that allows remote attackers to obtain sensitive information and install unauthorized software.


Upgrade to a version of Piriform CCleaner that is equal to or later than 5.34.

See Also



Plugin Details

Severity: Critical

ID: 103302

File Name: ccleaner_5_34.nasl

Version: 1.8

Type: local

Family: Backdoors

Published: 9/18/2017

Updated: 11/15/2018

Dependencies: ccleaner_installed.nbin

Risk Information


Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

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

Temporal Vector: E:F/RL:OF/RC:ND


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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

Temporal Vector: E:F/RL:O/RC:X

Vulnerability Information

CPE: cpe:/a:piriform:ccleaner

Required KB Items: installed_sw/CCleaner, SMB/Registry/Enumerated, SMB/ARCH

Patch Publication Date: 9/18/2017

Vulnerability Publication Date: 9/18/2017