Security readout for executives and security teams
Plain-English summary
Synology Photo Station had a path traversal flaw that could let a logged-in remote user write files outside the intended file-management area. The main business risk is unauthorized file modification on affected Synology deployments, not public unauthenticated takeover based on the provided sources.
Executive priority
Treat as a high-priority integrity issue for any Synology Photo Station deployment. Prioritize internet-reachable or broadly accessible instances first, especially where many users can authenticate.
Technical view
CVE-2021-29091 is a CWE-22 path traversal issue in Synology Photo Station before 6.8.14-3500. CVSS 3.1 is 7.7 with network access, low complexity, low privileges, no user interaction, changed scope, and high integrity impact. The source bundle does not specify the exact vector.
Likely exposure
Exposure is most likely where Synology Photo Station is installed below 6.8.14-3500 and reachable by authenticated users over a network. The sources do not identify specific NAS models or narrower version ranges.
Exploitation context
The provided data does not show CISA KEV listing or active exploitation evidence. Exploitation requires an authenticated remote user, according to the CVE description, and the public vector details are unspecified.
Researcher notes
The public record supports arbitrary file write through path traversal in the file management component, but does not disclose vectors. Do not assume unauthenticated exploitation, confidentiality impact, or available exploit code from these sources.
Mitigation direction
- Upgrade Synology Photo Station to 6.8.14-3500 or later per Synology advisory.
- Restrict external access to Photo Station until the package is confirmed updated.
- Review Photo Station accounts and remove unnecessary authenticated access.
- Check Synology guidance for any environment-specific remediation instructions.
Validation and detection
- Inventory Synology systems running Photo Station and record package versions.
- Confirm no Photo Station instance is below 6.8.14-3500.
- Verify Photo Station is not exposed to untrusted networks unless required.
- Review logs for unexpected authenticated file-write activity where available.
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-22: 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-29091 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
- 7.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
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:C/C:N/I:H/A:N3.14Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.7HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
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.