Piriform CCleaner 5.33.6162 Backdoor

Critical Nessus Plugin ID 103302


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: 2017/09/18

Updated: 2018/11/15

Dependencies: 103305

Risk Information

Risk Factor: Critical

CVSS v2.0

Base Score: 10

Temporal Score: 8.3

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

Temporal Vector: CVSS2#E:F/RL:OF/RC:ND

CVSS v3.0

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: CVSS:3.0/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: 2017/09/18

Vulnerability Publication Date: 2017/09/18