CVE-2021-4034CISA KEVEPSS p99.9%

CVE-2021-4034Red Hat Polkit Out-of-Bounds Read and Write Vulnerability

Red Hat / Polkit

Description

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

Scoring

CVSS 7.8 ()
VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS94.34% probability of exploitation · percentile 99.9% · 2026-09-30T12:00:21Z
Last modified2026-08-15

CISA KEV entry

Added to KEV: 2022-06-27

(incoming)1

TypeTargetConfidenceTier
KEVEntryRed Hat Polkit Out-of-Bounds Read and Write Vulnerabilitykev-cve-2021-40340%live

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Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.