CVE-2025-4679: A vulnerability in Synology Active Backup for Microsoft 365 allows remote authenticated attackers to obtain se

This month

MEDIUM 6.5WATCHLISTMITIGATE

CVE-2025-4679 is a medium-severity flaw (CVSS 6.5) affecting active backup for microsoft 365. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in Synology Active Backup for Microsoft 365 allows remote authenticated attackers to obtain sensitive information via unspecified vectors.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-522
Published	2025-05-16
Last modified	2026-06-17

Publisher (CNA): Synology Inc. · Vendor: synology

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-16 09:15 UTCPublished CVE record published
2026-06-17 09:33 UTCUpdated Record last modified

synology active backup for microsoft 365 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy active-backup-for-microsoft-365 || rpm -q active-backup-for-microsoft-365 || active-backup-for-microsoft-365 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-4679?

active backup for microsoft 365: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-4679 being exploited?

CVE-2025-4679 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-4679 affect?

CVE-2025-4679 affects active backup for microsoft 365. Severity is medium (CVSS 6.5). A vulnerability in Synology Active Backup for Microsoft 365 allows remote authenticated attackers to obtain sensitive information via unspecified vectors.

How urgent is CVE-2025-4679?

Priority 44/100. On your watchlist

Software pages

Synology vulnerabilities

References

← Back to latest CVEs