{"cve":"CVE-2021-45339","nvd":{"published":"2021-12-27T14:15:08.357","modified":"2026-06-17T04:13:17.347","status":"Modified","description":"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.","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":["CWE-863"],"references":["https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST0","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-AVST0","https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0"],"products":["avast:antivirus"],"source":"nvd","synced_at":"2026-10-19T21:26:33.761856376+00:00"},"epss":{"cve":"CVE-2021-45339","score":0.00327,"percentile":0.25782,"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."]}