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CVE Record

CVE-2018-8934: The Promontory chipset, as used in AMD Ryzen and Ryzen Pro platforms, has a backdoor in firmware, aka CHIME...

The Promontory chipset, as used in AMD Ryzen and Ryzen Pro platforms, has a backdoor in firmware, aka CHIMERA-FW.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2018-8934 describes a claimed firmware backdoor, called CHIMERA-FW, in the Promontory chipset used with AMD Ryzen and Ryzen Pro platforms. The business risk is persistence below the operating system, but AMD’s cited assessment says the reported issues require administrative access first. No CISA KEV listing is provided.

Executive priority

Treat this as a targeted hardware-trust risk, not a broad emergency based on the supplied evidence. Prioritize inventory and vendor firmware validation for sensitive AMD Ryzen/Ryzen Pro fleets, especially where administrator compromise would have high business impact.

Technical view

The CVE identifies Promontory chipset firmware as the affected area. Public references include CTS Labs material, Trail of Bits’ technical summary, and AMD’s initial assessment. The bundle does not provide CVSS, CWE, exact firmware versions, or vendor-fixed version data, so exposure analysis depends on hardware inventory and AMD/OEM guidance.

Likely exposure

Organizations may be exposed where AMD Ryzen or Ryzen Pro systems include the Promontory chipset and affected firmware. The bundle does not identify specific OEM models, BIOS versions, or CPEs, so asset matching is incomplete without vendor advisories.

Exploitation context

The supplied record is not KEV-listed and does not cite active exploitation. AMD’s referenced assessment characterized the reported class as requiring administrative access first, which reduces remote drive-by risk but still matters for post-compromise persistence and hardware trust.

Researcher notes

Key gaps are exact affected versions, patch identifiers, and independent exploitation status. The strongest direction is to correlate Promontory-based assets with AMD and OEM firmware guidance, while preserving the distinction between the CVE claim, third-party analysis, and AMD’s assessment.

Mitigation direction

  • Identify Ryzen and Ryzen Pro systems using Promontory chipsets.
  • Check AMD and OEM BIOS or firmware advisories for CVE-2018-8934 or CHIMERA-FW.
  • Apply vendor-approved BIOS or chipset firmware updates where available.
  • Prioritize systems handling privileged administration, sensitive workloads, or untrusted users.
  • Harden endpoint administration paths to reduce prerequisite local administrative compromise.

Validation and detection

  • Inventory hardware platform, chipset, BIOS version, and OEM model.
  • Compare installed firmware against AMD and OEM security guidance.
  • Review endpoint telemetry for unexplained privileged firmware, driver, or chipset-management activity.
  • Confirm whether affected systems have received vendor-approved firmware updates.
  • Track exceptions where no vendor-fixed firmware is documented.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

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CVE-2018-8934 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.