6.1

CVE-2025-66592: synology active_backup_for_business_agent Origin Validation Error

CVSS: 6.1v3.1MediumAnalyzed
Published 27-05-2026Last modified 02-06-2026
Open JSON

Vulnerability summary

CVE-2025-66592 is a medium (CVSS 6.1) Origin Validation Error vulnerability in synology active_backup_for_business_agent. EPSS estimates a 0.09% chance of exploitation in the next 30 days, higher than 0.2% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.09%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-05-2026
    PublishedVulnerability first disclosed.
  2. 02-06-2026
    Last modifiedVulnerability information updated.

Description

An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows local users to write arbitrary files with restricted content and conduct denial-of-service during installation.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.09%

Chance of exploitation in the next 30 days

Percentile

0%

Versus all other CVEs

30-day change

0.00 pp

From 0.09% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.09%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Synology2 products

1 vendor · 2 products

References

1 links