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cve recordhighexploited in the wild

CVE-2021-4034

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

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
ExploitedYes, in CISA KEV
Ransomware useKnown
Federal fix dueJul 18, 2022

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

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Our coverage of CVE-2021-4034

CVE-2008-4128high

July 2026 CVE Landscape

In July 2026, a significant increase in high-impact vulnerabilities was observed, with 85 critical flaws identified, 36 of which had a Very Critical Recorded Future Risk Score. A notable portion of these vulnerabilities were either already listed in CISA's Known Exploited Vulnerabilities catalog or were reported by vendors. The vulnerabilities affected a wide range of products from 61 vendors, with Microsoft products being the most frequently impacted.