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Release Notes for Antivirus Essential

Antivirus Essential is a free and easy-to-use package that protects your Synology NAS and your files from viruses. Before starting scanning operations, ensure the system has a minimum of 1 GB RAM for successful scanning and optimal performance.

Version: 1.5.7-3241

(2025-06-18)

What's New

  1. Updated ClamAV scanning engine to 1.4.2.
  2. Supports scanning for files stored locally within Hybrid Share folders.

Fixed Issues

  1. Fixed multiple security vulnerabilities regarding ClamAV (CVE-2025-20128, CVE-2024-20506, CVE-2024-20505).
  2. Minor bug fixes.

Version: 1.5.6-3225

(2024-05-14)

What's New

  1. Updated ClamAV scanning engine to 0.103.11.

Fixed Issues

  1. Minor bug fixes.

Limitation

  1. Starting from this version, scanning the default MailPlus shared folder and Maildir folders is no longer supported. To ensure the security of incoming MailPlus messages, activate an antivirus engine in Synology MailPlus Server > Security > Antivirus.

Version: 1.5.5-3206

(2023-04-25)

Compatibility & Installation

  1. Antivirus Essential 1.5.5-3206 requires DSM 7.2 and above.

Version: 1.5.4-3099

(2023-02-22)

Fixed Issues

  1. Fixed multiple security vulnerabilities regarding ClamAV (Synology-SA-23:01).

Version: 1.5.4-3098

(2022-08-10)

Important Note

This update is expected to be available in all regions within the next few days. The actual time of release may vary slightly depending on regions.

What's New

  1. Updated ClamAV scanning engine to 0.103.6.
  2. Added support to manual upload signature.

Fixed Issues

  1. Fixed multiple security vulnerabilities regarding ClamAV (CVE-2022-20698, CVE-2022-20770, CVE-2022-20785, CVE-2022-20792).

Version: 1.5.3-3077

(2022-02-17)

Important Note

The update will be available for selected regions within the following weeks, although the release time in each region may vary slightly.

What's New

  1. Added a check mechanism for volumes using AntiVirus Essential to show a warning message before they run a file system check in the event of file system errors.

Version: 1.5.2-3071

(2021-08-31)

Important Note

This update is expected to be available in all regions within the next few days. The actual time of release may vary slightly depending on regions.

Fixed Issues

  1. Fixed multiple security vulnerabilities regarding ClamAV. (CVE-2021-1252, CVE-2021-1404, CVE-2021-1405)

Version: 1.5.2-3067

(2021-06-01)

Compatibility and Installation

  1. Updated to be compatible with DSM 7.0.
  2. Supports backing up and restoring package configuration via Hyper Backup.

Limitation

  1. On Synology NAS models with less than 512 MB of RAM, updating virus definitions will take a longer time than on other models.