Avast Antivirus EUVD-2025-210130

Patch available per vendor advisory: ensure the virus definition build is at or above 25021208, which is delivered automatically through the Gen Digital definition update stream consumed by Avast, AVG, Norton, Avast One, and Avast Business Antivirus - administrators should verify the engine has successfully pulled an update past that build via the product's update status UI or management console. Because the fix ships through definitions rather than installer packages, no product reinstallation or version upgrade is required, but environments that block or stale-cache definition updates (air-gapped endpoints, restrictive proxies, paused updates) must release those constraints. As a temporary compensating control before the definition update applies, restrict the scanner's exposure to attacker-supplied archives by blocking inbound ZIPs at email and web gateways and disabling automatic scanning of removable media, accepting the trade-off that legitimate archive-borne malware will not be caught by on-access scanning during the window. Refer to https://www.gendigital.com/us/en/contact-us/security-advisories/ for the authoritative advisory.