Security readout for executives and security teams
Plain-English summary
CVE-2021-46794 is a firmware-level AMD Secure Processor issue that can crash affected systems by triggering a data abort. The public description points to denial of service, not data theft or privilege escalation. Business urgency is highest where AMD desktop, mobile, workstation, or Threadripper systems support critical services.
Executive priority
Treat this as a high-priority firmware availability risk for critical AMD fleets. It is not currently documented as exploited in the provided sources, but unauthenticated denial-of-service impact justifies inventory, vendor guidance review, and planned firmware remediation.
Technical view
The issue is insufficient bounds checking in ASP during SMI mailbox checksum calculation. It may permit an out-of-bounds read that causes a data abort, resulting in potential denial of service. CVSS 3.1 is 7.5 with network attack vector, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure appears tied to AMD platforms using affected AGESA firmware across listed Ryzen, Threadripper, Threadripper PRO, and Athlon processor families. The bundle does not provide exact vulnerable firmware versions, so confirmation requires AMD and OEM firmware guidance.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates remote, unauthenticated reachability, but the available sources only substantiate a potential denial-of-service outcome.
Researcher notes
Evidence is limited to the CVE description, CVSS data, affected AMD product families, and AMD advisory reference. The bundle does not include proof-of-concept status, exact vulnerable AGESA versions, workaround details, or exploit telemetry.
Mitigation direction
- Review AMD-SB-4001 and relevant OEM BIOS or firmware advisories.
- Inventory AMD systems by processor family, motherboard model, BIOS, and AGESA version.
- Prioritize critical or externally reachable systems for vendor-guided firmware remediation.
- Do not assume operating system patches resolve ASP firmware exposure.
- Track OEM release notes for CVE-2021-46794 or related AGESA updates.
Validation and detection
- Compare deployed AMD platforms against the processor families listed in AMD guidance.
- Record BIOS, UEFI, and AGESA versions from endpoint management or asset tooling.
- Confirm whether OEM advisories identify a fixed firmware level for each platform.
- After updating, verify firmware versions and rerun vulnerability inventory checks.
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-125: 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-2021-46794 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:N/I:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary 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:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001CVE reference · vendor-advisory
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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.