polkit /usr/bin/pkexec access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
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A vulnerability, which was classified as critical, has been found in polkit (version now known). This issue affects some unknown processing of the file /usr/bin/pkexec. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability.

The weakness was presented 01/26/2022. It is possible to read the advisory at qualys.com. The identification of this vulnerability is CVE-2021-4034 since 11/29/2021. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

A public exploit has been developed by BLASTY in C and been published even before and not after the advisory. The exploit is available at haxx.in. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

It is possible to mitigate the problem by applying the configuration setting chmod 0755 /usr/bin/pkexec.



CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.1

VulDB Base Score: 8.8
VulDB Temp Score: 8.1
VulDB Vector: 🔍
VulDB Reliability: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍


Class: Access control
CWE: CWE-284 / CWE-266
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: BLASTY
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Config
Status: 🔍

0-Day Time: 🔍

Config: chmod 0755 /usr/bin/pkexec


11/29/2021 🔍
01/25/2022 +57 days 🔍
01/26/2022 +1 days 🔍
01/26/2022 +0 days 🔍
01/26/2022 +0 days 🔍


Advisory: qualys.com
Status: Confirmed

CVE: CVE-2021-4034 (🔍)
scip Labs: https://www.scip.ch/en/?labs.20161013


Created: 01/26/2022 07:20 AM
Updated: 01/26/2022 07:58 AM
Changes: 01/26/2022 07:20 AM (39), 01/26/2022 07:25 AM (1), 01/26/2022 07:58 AM (6)
Complete: 🔍
Submitter: misc
Committer: misc


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