Security readout for executives and security teams
Plain-English summary
Synology Photo Station had a file-upload weakness that could let a logged-in remote user run code on the NAS. The flaw affects Photo Station versions before 6.8.14-3500. This is serious because NAS systems often hold sensitive files and may be reachable by many users.
Executive priority
Prioritize remediation for any exposed or multi-user Synology Photo Station instance. The business risk is unauthorized code execution on a file storage platform, potentially affecting sensitive data and service availability.
Technical view
CVE-2021-29092 is CWE-434 in Synology Photo Station's file management component. The CVE states that remote authenticated users can execute arbitrary code via unspecified upload vectors. CVSS 3.1 is 8.8 with network access, low attack complexity, low privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to Synology Photo Station deployments before 6.8.14-3500. Risk is highest where Photo Station is enabled and reachable over the internet, VPN, or broad internal networks, and where low-privilege accounts exist.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The public description confirms possible arbitrary code execution by authenticated remote users, but the attack vectors are unspecified.
Researcher notes
The advisory-linked CVE record provides the affected product, fixed-before version boundary, CVSS vector, CWE, and high-level impact. It does not provide exploit mechanics, affected CPEs, or evidence of exploitation, so validation should focus on version, reachability, and authentication scope.
Mitigation direction
- Upgrade Synology Photo Station to 6.8.14-3500 or later.
- Review Synology advisory guidance for the affected deployment.
- Restrict Photo Station access to trusted networks until updated.
- Remove unnecessary Photo Station accounts and low-trust access.
- Monitor NAS accounts for unexpected authentication or upload activity.
Validation and detection
- Inventory Synology NAS devices running Photo Station.
- Confirm installed Photo Station version is 6.8.14-3500 or later.
- Identify whether Photo Station is internet-exposed or broadly reachable.
- Review Photo Station and NAS logs for unusual authenticated upload activity.
- Confirm vulnerable instances are updated or access-restricted.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-434: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-29092 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_20_20CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Unrestricted Upload of File with Dangerous Type
Unrestricted Upload of File with Dangerous Type represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.