CVE-2025-30028
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability in Active Backup for Business allows unauthorized remote attackers to read arbitrary files.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA path traversal vulnerability in Synology Active Backup for Business allows unauthenticated remote attackers to read arbitrary files on the NAS device. The vulnerability is network-exploitable with low complexity and no user interaction required, enabling exfiltration of sensitive configuration files, credentials, or data stored on the affected system.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 2.7.1-23234= 2.7.1-13234= 2.7.1-3234CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify Active Backup for Business is installedOpen Synology Package Center and look for 'Active Backup for Business' in the installed packages list, or run 'pkginfo | grep -i active-backup' via SSH on the NASAffected if The package is installed and running on the system
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Check the installed version numberIn Synology Package Center, click on Active Backup for Business and view the version details, or run 'pkginfo -l ActiveBackupforBusiness' via SSH to retrieve the exact version stringAffected if The version matches 2.7.1-23234, 2.7.1-13234, or 2.7.1-3234 exactly
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Confirm the service is network-accessibleCheck if the Synology NAS is reachable on the network and that Active Backup for Business ports are open. Use 'netstat -an | grep -E "(port|service)"' or review the NAS firewall rules to determine if the service is exposed to untrusted networksAffected if The service port is open to network interfaces accessible from untrusted networks (not restricted to localhost or trusted VLAN)
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Verify the web interface is accessible remotelyAttempt to access the Active Backup for Business web portal from an external network or check if the web service port (typically 30000-30099 range) is listening on external interfaces using 'netstat -tulpn'Affected if The web portal responds to requests from untrusted network segments
If Active Backup for Business is installed with version 2.7.1-23234, 2.7.1-13234, or 2.7.1-3234 AND the service is network-accessible, the environment is vulnerable to unauthenticated path traversal attacks.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply the vendor patch from Synology when available. Until then, restrict network access to the Active Backup for Business service using firewall rules or network segmentation to limit exposure to trusted internal networks only.
- Consultation2.0 h
- Implementation3.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-30028 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-30028 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data