Security readout for executives and security teams
Plain-English summary
This is a low-severity web session hardening issue in listed WirelessHART gateway firmware. A cookie lacks the HttpOnly attribute, so browser-side JavaScript can read or change it. Business risk is limited by the CVSS local attack vector and required user interaction, but affected industrial gateway management interfaces should still be reviewed.
Executive priority
Treat as a low-priority remediation item unless the affected gateways are exposed to broadly used admin workstations or weak network segmentation. Include it in industrial asset firmware review rather than emergency response.
Technical view
CVE-2021-34563 maps to CWE-1004: Sensitive Cookie Without HttpOnly Flag. The supplied record lists firmware 3.0.8 and 3.0.9 for WHA-GW-F2D2-0-AS-Z2-ETH variants. CVSS 3.1 is 3.3: AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
Likely exposure
Exposure is likely limited to organizations running the listed gateway models on firmware 3.0.8 or 3.0.9, especially where administrators use the web interface from endpoints that could run untrusted JavaScript.
Exploitation context
The bundle does not report known active exploitation, and KEV status is false. The weakness could support cookie disclosure or modification through client-side JavaScript, but the provided CVSS vector indicates local access and user interaction are required.
Researcher notes
The source bundle contains a vendor naming inconsistency: the description names PEPPERL+FUCHS, while affected products list Phoenix Contact WHA-GW variants. Scope validation should use the CVE record and VDE advisory before concluding product ownership or remediation status.
Mitigation direction
- Inventory listed gateway models and firmware versions 3.0.8 and 3.0.9.
- Review VDE-2021-027 and vendor guidance for supported remediation or upgrade direction.
- Restrict administrative web access to trusted management networks where operationally feasible.
- Avoid using affected management interfaces from general-purpose browsing sessions.
- Apply vendor-approved firmware or configuration changes only when confirmed by official guidance.
Validation and detection
- Confirm whether WHA-GW-F2D2-0-AS-Z2-ETH variants are deployed.
- Verify firmware version on each identified gateway.
- Check the management interface session cookie attributes in a controlled administrative test.
- Document whether the cookie lacks the HttpOnly attribute.
- Record remediation status against vendor advisory VDE-2021-027.
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-1004: 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-2021-34563 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
- Low
- CVSS
- 3.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/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:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N1.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.3LowVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://cert.vde.com/en-us/advisories/vde-2021-027CVE 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.
Sensitive Cookie Without 'HttpOnly' Flag
Sensitive Cookie Without 'HttpOnly' Flag represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.