Security readout for executives and security teams
Plain-English summary
This flaw affects Synology DSM workflow management. An authenticated remote user could cause web script or HTML to be injected, potentially impacting another user who interacts with affected content. Business urgency is moderate because authentication and user interaction are required, but NAS management systems often hold sensitive data.
Executive priority
Treat as a moderate-priority patching item. Accelerate remediation for internet-reachable DSM systems, shared administrative environments, or devices holding regulated, customer, or backup data.
Technical view
CVE-2021-43929 is a CWE-74 injection issue in Synology DiskStation Manager before 7.0.1-42218-2. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L, indicating network reachability, low attack complexity, required privileges, required user interaction, and changed scope.
Likely exposure
Exposure is likely limited to Synology DSM deployments running versions before 7.0.1-42218-2, especially where DSM is reachable by many authenticated users or exposed beyond trusted management networks.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not marked KEV. Exploitation requires authenticated access and user interaction. The specific injection vectors are not disclosed in the source bundle.
Researcher notes
Public details are limited: the advisory and CVE describe the impacted component and fixed version but not endpoints, payload shape, or proof of exploitation. Avoid assuming broader Synology product impact without vendor confirmation.
Mitigation direction
- Upgrade Synology DSM to 7.0.1-42218-2 or later.
- Review Synology advisory Synology_SA_22_01 for vendor-specific guidance.
- Restrict DSM access to trusted networks and VPNs.
- Limit DSM accounts to required users and least privilege.
- Monitor DSM audit logs for suspicious authenticated activity.
Validation and detection
- Inventory Synology DSM versions across all NAS devices.
- Confirm no managed DSM system is older than 7.0.1-42218-2.
- Check whether DSM is reachable from untrusted networks.
- Review accounts with DSM workflow management access.
- Verify remediation against Synology advisory Synology_SA_22_01.
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-74: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCVE-2021-43929 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
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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:L/UI:R/S:C/C:L/I:L/A:L2.33.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/security/advisory/Synology_SA_22_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 in Output Used by a Downstream Component ('Injection')
Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.