Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in encrypted share umount functionality in Syno
Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in encrypted share umount functionality in Synology Active Backup for Business before 2.7.1-13234, 2.7.1-23234 and 2.7.1-3234 allows remote authenticated users to write specific files via unspecified vectors.
- Published
- Feb 13, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.4% · 31th percentile
- CWE
- CWE-73
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Report tools
Action score
26
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · synology
- 6.5
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| synology | active backup for business agent | cpe:2.3:a:synology:active_backup_for_business_agent |
| synology | diskstation manager | cpe:2.3:o:synology:diskstation_manager |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- synology active backup for business agentbefore 2.7.1-13234
- synology active backup for business agentbefore 2.7.1-3234
- synology active backup for business agentbefore 2.7.1-23234
Versions reported by the vendor
Affected version ranges reported by the assigning authority (synology). Independent of NVD's CPE analysis and usually ahead of it.
Synology Active Backup for Business
- before 2.7.1-3234affected · semver
- before 2.7.1-13234affected · semver
- before 2.7.1-23234affected · semver
Same product
synology: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-47264Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in agent-related functionality in Synology Acti26Monitor
- CVE-2025-66592An origin validation error vulnerability in Synology Active Backup for Business Agent before 3.1.0-4967 allows local users to write arbitrar22Monitor
- CVE-2023-52949Missing authentication for critical function vulnerability in proxy settings functionality in Synology Active Backup for Business Agent befo22Monitor
- CVE-2023-52950Missing encryption of sensitive data vulnerability in login component in Synology Active Backup for Business Agent before 2.7.0-3221 allows 21Monitor
- CVE-2023-52948Missing encryption of sensitive data vulnerability in settings functionality in Synology Active Backup for Business Agent before 2.7.0-3221 20Monitor
- CVE-2023-52947Missing authentication for critical function vulnerability in logout functionality in Synology Active Backup for Business Agent before 2.6.313Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Synology Active Backup for Business | 2.7.1-13234 | Vendor (CNA) |
| Synology Active Backup for Business | 2.7.1-23234 | Vendor (CNA) |
| Synology Active Backup for Business | 2.7.1-3234 | Vendor (CNA) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Zhao Runzi (赵润梓)finder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
—
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
- CVE-2023-52949140 days apartMissing authentication for critical function vulnerability in proxy settings functionality in Synology Active Backup for Business Agent befo22Monitor
- CVE-2023-52947140 days apartMissing authentication for critical function vulnerability in logout functionality in Synology Active Backup for Business Agent before 2.6.313Monitor
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- high · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- High
- Availability impact
- None
Weakness class (CWE)
CWE-73 · External Control of File Name or PathCVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- Leverage Alternate EncodingCAPEC-267likelihood: High · High
- Using Slashes and URL Encoding Combined to Bypass Validation LogicCAPEC-64likelihood: High · High
- URL EncodingCAPEC-72likelihood: High · High
- Manipulating Web Input to File System CallsCAPEC-76likelihood: High · Very High
- Using Escaped Slashes in Alternate EncodingCAPEC-78likelihood: High · High
- Using Slashes in Alternate EncodingCAPEC-79likelihood: High · High
- Using UTF-8 Encoding to Bypass Validation LogicCAPEC-80likelihood: High · High
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.