High severity7.8NVD Advisory· Published Dec 27, 2021· Updated Jun 17, 2026

CVE-2021-45339

Description

Privilege escalation vulnerability in Avast Antivirus prior to 20.4 allows a local user to gain elevated privileges by "hollowing" trusted process which could lead to the bypassing of Avast self-defense.

Affected products

Avast\!/Antivirus2 versions
cpe:2.3:a:avast:antivirus:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:avast:antivirus:*:*:*:*:*:*:*:*range: <20.4
- (no CPE)range: <20.4
Avast/Antivirusdescription

Patches

Vulnerability mechanics

References

github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST0nvdExploitThird Party Advisory
www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0nvdVendor Advisory

News mentions

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