Release Notes for Antivirus Essential

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.

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.

Compatibility & Installation

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

Fixed Issues

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

Fixed Issues

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

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).

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.

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)

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 0.103.2.

Fixed Issues

1. Fixed an issue where AntiVirus might fail to update virus signatures.

2. Fixed an issue where the files without changes might still be scanned when Smart Scan was enabled.

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.

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. Enhanced scanning performance by dividing virus signatures depending on available memory.

2. Upgraded ClamAV engine to 0.102.3.

Fixed Issues

1. Fixed an issue where Smart Scan might not scan the newly added files properly.

2. Fixed an issue where AntiVirus might fail to upgrade virus signatures.

3. Fixed a security vulnerability. (Synology-SA-21:05)

Important Note

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

Fixed Issues

1. Fixed the issue where AntiVirus might fail to update virus definitions upon initial installation or when their file size exceeds a certain limit.

Important Note

1. This update has been recalled on Jan. 16 owing to an issue about updating virus definitions.

2. This update was re-released on Feb. 4, and the aforementioned issue has been fixed in 1.4.7-2791.

What's New

1. Added support for Smart Scan to compare with the last scanning results and only scan files which had been modified.

2. Upgraded ClamAV scanning engine.

Fixed Issues

1. Fixed the issue where certain file types might prevent Antivirus from completing the scanning process.

2. Fixed the issue where AntiVirus might mistakenly quarantine certain files in Time Machine backup folder and prevent users from restoring them properly.

3. Fixed the issue where scheduled scan might run when AntiVirus is disabled.

What's New

1. Upgraded ClamAV engine.

Fixed Issues

1. Fixed a security vulnerability regarding ClamAV (CVE-2017-11423).

2. Fixed an issue where AntiVirus logs could not be removed in Safari browser.

3. Fixed an issue where Active Backup might fail to restore data after AntiVirus scans.

4. Fixed an issue where AntiVirus might fail to upgrade signatures.

1. Thai user interface is now available.

2. Upgraded ClamAV built-in signatures.

1. Fixed an issue where notification might not work properly.
2. Fixed multiple security vulnerabilities regarding ClamAV. (CVE-2018-1000085, CVE-2018-0202)

1. Fixed multiple security vulnerabilities regarding ClamAV (CVE-2017-12374, CVE-2017-12375, CVE-2017-12376, CVE-2017-12377, CVE-2017-12378, CVE-2017-12379, CVE-2017-12380).

1. Fixed an issue where AntiVirus might not work properly when migrated from DSM 5.2.

What’s New:

1. Supports comprehensive operation of a window.

2. Improved the number of items displayed per page in the quarantine list.

3. Enhanced scanning performance by reducing the scanning time and memory usage

Fixed Issues:

1. Fixed an issue where file scanning on certain models might fail.

2. Fixed an issue where updating virus signature database might fail.

1. Fixed an issue where AntiVirus might fail to stop scanning when Intrusion Prevention is enabled.
2. Fixed an issue where AntiVirus might fail to scan when a file path is longer than 256 bytes.
3. Fixed a security vulnerability regarding ClamAV (CVE-2012-6706).

What’s New:

1. Added support for auto update of Engine.

Bug fixes:

1. Fixed an issue where error messages might display during file scanning.

Limitation:

1. Files larger than 2GB are beyond the scanning capability. Certain models with smaller RAM size is not able to scan files over 1GB.

1. Fixed an issue where file scanning might take more time after upgrading to DSM 6.0.

1. Fixed an issue where database update might fail.
2. Fixed an issue where database update might not end.
3. Upgraded ClamAV.
4. Enhanced system performance by processing one scan task at a time.

1. Upgraded ClamAV and McAfee scanning engine.
2. Fixed an issue where operations might fail when deleting or restoring a large amount of files from the quarantine.
3. Fixed an issue where DSM system files might be deleted due to false alarm.

1. Fixed an issue where system file in Security Advisor could be deleted due to false alarm.