Security readout for executives and security teams
Plain-English summary
Synology Photo Station had a remotely reachable SQL injection flaw. An unauthenticated attacker could send crafted input to the Photo Station component and run arbitrary database queries. For businesses, the main concern is exposed NAS photo services where database confidentiality, integrity, and availability could be affected.
Executive priority
Treat as high priority for any internet-facing Synology Photo Station. Patch or remove exposure promptly because exploitation requires no account or user interaction, even though active exploitation is not evidenced in the provided sources.
Technical view
CVE-2019-11821 is CWE-89 SQL injection in synophoto_csPhotoDB.php in Synology Photo Station. The issue affects versions before 6.8.11-3489 and before 6.3-2977 and is triggered through the type parameter. CVSS 3.1 is 7.3: network exploitable, low complexity, no privileges, no user interaction, with low C/I/A impact.
Likely exposure
Exposure is limited to Synology Photo Station deployments running versions before 6.8.11-3489 or before 6.3-2977. Internet-facing NAS devices or publicly accessible Photo Station services carry higher operational risk. The provided sources do not name other affected Synology products.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The vulnerability is still concerning because the CVSS vector indicates remote, unauthenticated, low-complexity exploitation without user interaction.
Researcher notes
The public details are concise: SQL injection in synophoto_csPhotoDB.php via type. Affected version data is expressed as fixed-before thresholds, while exact vulnerable branch mapping is incomplete in the provided bundle. Avoid assuming exploit availability or broader Synology product impact.
Mitigation direction
- Upgrade Synology Photo Station to the fixed version for your supported release track or later.
- Check Synology advisory SA-19-01 for vendor-specific update guidance.
- Restrict external access to Photo Station where business use does not require it.
- Review NAS exposure through firewall, VPN, and reverse proxy rules.
- Monitor vendor guidance for any additional remediation details.
Validation and detection
- Inventory Synology Photo Station instances and record installed package versions.
- Confirm versions are at or above 6.8.11-3489 or 6.3-2977 as applicable.
- Identify whether Photo Station is reachable from the internet.
- Review access logs for unusual requests involving synophoto_csPhotoDB.php and the type parameter.
- Verify update completion through Synology package or administrative status views.
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-89: Database access and collection lookup
Injection into data stores can inform collection, data access, and exfiltration detection reviews. 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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-11821 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
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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:N/UI:N/S:U/C:L/I:L/A:L3.93.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_19_01CVE 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.
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.