Security readout for executives and security teams
Plain-English summary
This AMD issue lets a highly privileged local attacker misconfigure Trusted Memory Regions, potentially damaging system integrity or causing availability problems. It is not a remote internet-facing bug, and the provided sources do not show active exploitation.
Executive priority
Treat this as a moderate-priority hardware and firmware hygiene issue. It does not currently justify emergency response based on the supplied evidence, but affected enterprise endpoints and embedded systems should be identified and updated through normal risk-based maintenance.
Technical view
CVE-2021-26367 affects listed AMD Ryzen, Athlon, Embedded, Radeon RX 6000, and Radeon PRO W6000 products. CVSS 3.1 is 5.7: local attack vector, high complexity, high privileges, no user interaction, no confidentiality impact, high integrity and availability impact.
Likely exposure
Exposure is likely limited to systems using the specific AMD processor, embedded processor, or graphics product families and firmware/software versions listed by AMD. Highest relevance is managed endpoints, workstations, embedded systems, and GPU-equipped systems where local privileged access is plausible.
Exploitation context
The source bundle marks KEV as false and provides no evidence of active exploitation. Exploitation requires local access, high privileges, and high complexity, making opportunistic remote exploitation unlikely based on the supplied evidence.
Researcher notes
The affected list contains some repeated and conflicting Ryzen entries, including affected and unaffected statuses for similar product names. Validate against AMD advisories before drawing product-level conclusions. The key impact is integrity and availability through TMR misconfiguration, not data disclosure.
Mitigation direction
- Review AMD SB-4004 and SB-6005 for applicable vendor guidance.
- Inventory affected AMD CPU, embedded, and GPU models across managed assets.
- Check OEM firmware, BIOS, and AMD software update channels for remediation.
- Prioritize systems where untrusted users can gain local administrative access.
- Limit local administrative privileges and firmware configuration access.
Validation and detection
- Compare asset models against the affected AMD product list.
- Record BIOS, platform firmware, and AMD software versions for matching systems.
- Confirm applicability against AMD SB-4004 and SB-6005.
- Track remediation status through endpoint inventory or configuration management.
- Document exceptions where affected products are present but vendor fixes are unavailable.
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.
CVE-2021-26367 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
- 5.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
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:H/PR:H/UI:N/S:U/C:N/I:H/A:H0.55.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.7MediumVector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
Source materials
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.