Security readout for executives and security teams
Plain-English summary
Phoenix Contact FL MGUARD DM 1.12.0 and 1.13.0 can expose configuration profiles through its bundled Apache web server without requiring login. Those profiles may contain sensitive VPN material, including private keys. This is primarily a confidentiality issue, but the exposed data could enable further compromise of protected networks.
Executive priority
Treat as high priority for environments relying on mGuard VPN configurations. The main business risk is credential and key exposure, which can undermine network segmentation and remote-access trust even without direct code execution.
Technical view
CVE-2021-34579 is improper privilege management in FL MGUARD DM for Microsoft Windows. Network-accessible Apache content does not enforce configured login credentials, allowing unauthenticated reading of mGuard ATV configuration profiles. CVSS 3.1 is 7.5, driven by network access, low complexity, no privileges, no user interaction, and high confidentiality impact.
Likely exposure
Exposure is likely limited to organizations running PHOENIX CONTACT FL MGUARD DM 2981974 versions 1.12.0 or 1.13.0 on Microsoft Windows, especially where the bundled Apache web server is reachable from untrusted networks.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is still serious because unauthenticated network access may disclose VPN configuration profiles and private keys.
Researcher notes
Affected scope is explicitly versions 1.12.0 and 1.13.0, with default status otherwise unaffected. The provided evidence names information disclosure through unauthenticated Apache access, not integrity or availability impact. Patch details are not included in the bundle, so remediation should be confirmed against vendor guidance.
Mitigation direction
- Identify all FL MGUARD DM 1.12.0 and 1.13.0 Windows installations.
- Check the Phoenix Contact/VDE advisory for vendor remediation or upgrade guidance.
- Restrict network reachability to the bundled Apache web server.
- Review exposed ATV profiles for sensitive VPN keys or credentials.
- Rotate potentially exposed IPsec private keys after assessing access.
Validation and detection
- Confirm installed FL MGUARD DM version and Windows deployment status.
- Inventory hosts exposing the bundled Apache web server.
- Verify whether authentication is actually enforced before profile access.
- Review logs for unexpected access to ATV profile files.
- Check whether any exposed profiles contain private keys.
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
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ATT&CK lookup starting points
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CWE-269: Authorization and privilege behavior lookup
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Open ATT&CK lookupCVE-2021-34579 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://cert.vde.com/en/advisories/VDE-2021-035/CVE reference
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 Privilege Management
Improper Privilege Management represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.