How severe is CVE-2025-4679?

CVE-2025-4679 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-4679 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4679?

CVE-2025-4679 affects Synology Active Backup For Microsoft 365. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-4679?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-4679 have an EU (EUVD) identifier?

Yes. CVE-2025-4679 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-15423.

When was CVE-2025-4679 published?

CVE-2025-4679 was published on 2025-05-16 and last updated on 2026-06-17.

CVE-2025-4679

CVE-2025-4679 is a medium-severity vulnerability in Synology Active Backup For Microsoft 365 with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-15423
Weakness: CWE-522
Affected product: Synology Active Backup For Microsoft 365
Published: 2025-05-16
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-4679?: A vulnerability in Synology Active Backup for Microsoft 365 allows remote authenticated attackers to obtain sensitive information via unspecified vectors.
How severe is CVE-2025-4679?: CVE-2025-4679 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-4679 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4679?: CVE-2025-4679 affects Synology Active Backup For Microsoft 365. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-4679?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-4679 have an EU (EUVD) identifier?: Yes. CVE-2025-4679 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-15423.
When was CVE-2025-4679 published?: CVE-2025-4679 was published on 2025-05-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:synology:active_backup_for_microsoft_365:-:*:*:*:*:*:*:*

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