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

criticalknown exploitedpublic exploitCVE-2021-4034
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
The Red Hat polkit pkexec utility contains an out-of-bounds read and write vulnerability that allows for privilege escalation with administrative rights.

CSIRTS triage

vendor: Red Hatproduct: PolkitPrivilege escalation
What
The Red Hat polkit pkexec utility contains an out-of-bounds read and write vulnerability that allows for privilege escalation.
Who is affected
Users of the Red Hat polkit utility.
Urgency
Remediation is critical due to confirmed exploitation and high severity.
Action
Update to the latest version of the polkit utility.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-06-27
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-4034coverage & exploitation statusNVD · CVE.org

Recent advisories for Red Hat Polkit

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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