CVE-2021-45338
HIGHAvast Antivirus < 20.4 - Privilege Escalation via Unnecessarily Powerful Internal Methods
Title source: llmDescription
Multiple privilege escalation vulnerabilities in Avast Antivirus prior to 20.4 allow a local user to gain elevated privileges by calling unnecessarily powerful internal methods of the main antivirus service which could lead to the (1) arbitrary file delete, (2) write and (3) reset security.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_misc
https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0
Exploit, Third Party Advisory x_refsource_misc
https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.1
Exploit, Third Party Advisory x_refsource_misc
https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.2
Exploit, Third Party Advisory x_refsource_misc
https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.3
Scores
CVSS v3
7.8
EPSS
0.0038
EPSS Percentile
30.2%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details
Status
published
Products (1)
avast/antivirus
< 20.4
Published
Dec 27, 2021
Tracked Since
Feb 18, 2026