CVE-2021-45337

moderate-risk
Published 2021-12-27

Privilege escalation vulnerability in the Self-Defense driver of Avast Antivirus prior to 20.8 allows a local user with SYSTEM privileges to gain elevated privileges by "hollowing" process wsc_proxy.exe which could lead to acquire antimalware (AM-PPL) protection.

Do I need to act?

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0.11% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Avast

References (4)

Exploit https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST3...
Vendor Advisory https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antit...
Exploit https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST3...
Vendor Advisory https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antit...
32
/ 100
moderate-risk
Severity 27/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal