What is CVE-2021-45339?

CVE-2021-45339 is a high-severity vulnerability in Avast Antivirus, classified under Incorrect Authorization. CVSS score: 7.8/10. Published 2021-12-27.

How severe is CVE-2021-45339?

High severity. CVSS v3 base score is 7.8 out of 10.

Auth bypass in Avast Antivirus

CVE-2021-45339

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.

Vulnerability class: Broken Access Control

EPSS: 0.003 (23.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Avast Antivirus
N/a — versions n/a

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-45339?: CVE-2021-45339 is a high-severity vulnerability in Avast Antivirus, classified under Incorrect Authorization. CVSS score: 7.8/10. Published 2021-12-27.
How severe is CVE-2021-45339?: High severity. CVSS v3 base score is 7.8 out of 10.