LIVE · cybersecurity feed
Live wire
cve recordhighexploited in the wild3 of 3 cataloguesransomwareexploit reported

CVE-2021-4034

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

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
EPSS94.9%99.9th percentile
Exploited3 KEV sources
Ransomware useKnown
Federal fix dueJul 18, 2022
patch window

Called exploited 130 days after disclosure.

Measured from the CVE publication date to the earliest of 3 KEV catalogues that list it.

The life of this vulnerability

  1. CVE published
  2. First KEV listing4mo
  3. Last KEV listing20d
  4. Last sighting4.1y

Gaps are compressed to equal steps. The elapsed time is printed under each.

Which catalogues call it exploited

Sources3 of 3
Listings differ by20 d
Strongest claimconfirmed

3 catalogues list it. CIRCL aggregates the others and is shown but not counted.

Public exploitation evidence

46 public reports collected from VulnCheck and CIRCL, first on Jun 7, 2022. Each links to its original source. We have not verified them.

Description

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

Required action (CISA)

Apply updates per vendor instructions.

References

← Back to the CVE Tracker

Our coverage of CVE-2021-4034

CVE-2008-4128high

July 2026 CVE Landscape

Cybersecurity researchers identified 85 high-impact vulnerabilities in July 2026 that require urgent remediation, marking a 44% increase from the previous month. Of these, 36 were assigned a "Very Critical" risk score by Insikt Group. The vulnerabilities affected products from 61 vendors, with Microsoft accounting for approximately 12% of the total.