{"cve":"CVE-2021-45338","nvd":{"published":"2021-12-27T14:15:08.170","modified":"2026-06-17T04:13:17.227","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.1","https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.2","https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.3","https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0","https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST1.1"],"products":["avast:antivirus"],"source":"nvd","synced_at":"2026-10-19T21:26:33.761856376+00:00"},"epss":{"cve":"CVE-2021-45338","score":0.00393,"percentile":0.33529,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}