CVE-2021-45338: avast antivirus
Vulnerability summary
CVE-2021-45338 is a high (CVSS 7.8) vulnerability in avast antivirus. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.5% of scored vulnerabilities. 1 public exploit is recorded.
Timeline
- 27-12-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
0.38%
Chance of exploitation in the next 30 days
Percentile
31%
Versus all other CVEs
30-day change
0.00 pp
From 0.38% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundVulnerability Disclosures
Maturity: poc
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Avast1 product
- antivirus< 20.4
1 vendor · 1 product
References
4 links- www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0X Refsource MISCVendor Advisory
- github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.1X Refsource MISCExploitThird Party Advisory
- github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.2X Refsource MISCExploitThird Party Advisory
- github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.3X Refsource MISCExploitThird Party Advisory