Vulnerability in Avast Antivirus
CVE-2021-45338
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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (29.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
References
- www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bu… (Vendor Advisory)
- github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.1 (Exploit, Third Party Advisory)
- github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.2 (Exploit, Third Party Advisory)
- github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.3 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-45338?
- CVE-2021-45338 is a high-severity vulnerability in Avast Antivirus. CVSS score: 7.8/10. Published 2021-12-27.
- How severe is CVE-2021-45338?
- High severity. CVSS v3 base score is 7.8 out of 10.