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CVE Watch15 ago 2026

CVE-2021-4034

Red Hat Polkit Out-of-Bounds Read and Write Vulnerability

CVSS

7.8

Alto

EPSS

94.9%

p100

KEV

SÍ

27 jun 2022

Exploit Today

80

0-100

Publicado: 28 ene 2022 · Última mod.: 15 ago 2026 · CWE-787 · CWE-125

EPSS · 30d
94.3%EPSS · 30 días94.9%
2026-09-162026-10-14
Ficha del catálogo KEV

Producto

Red Hat / Polkit

Vulnerabilidad

Red Hat Polkit Out-of-Bounds Read and Write Vulnerability

Añadido a KEV

27 jun 2022

Remediar antes de

18 jul 2022

Uso conocido en ransomware

Sí

Descripción resumida

The Red Hat polkit pkexec utility contains an out-of-bounds read and write vulnerability that allows for privilege escalation with administrative rights.

Acción requerida

Apply updates per vendor instructions.

Notas

https://nvd.nist.gov/vuln/detail/CVE-2021-4034

Descripción técnica

A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.

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