Security readout for executives and security teams
Plain-English summary
This is a high-severity AMD firmware issue affecting AGESA on several Ryzen and Threadripper platforms. A privileged attacker could corrupt ASP memory, which may allow integrity loss or code execution. Business urgency depends on whether those AMD platforms and vulnerable firmware are present.
Executive priority
Treat this as a high-priority firmware governance item, not a routine application patch. Prioritize asset identification and vendor firmware remediation for affected AMD systems, especially high-value or shared environments.
Technical view
CVE-2021-46773 is insufficient input validation in ABL. The published vector is CVSS 3.1 8.8, AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Sources say memory corruption in ASP memory may result in loss of integrity or code execution.
Likely exposure
Exposure is likely limited to systems using listed AMD Ryzen and Threadripper platforms with affected AGESA firmware. The bundle lists broad product families and “various” versions, but no CPEs or exact firmware ranges.
Exploitation context
The bundle does not establish active exploitation. KEV is false, and the cited sources do not claim observed exploitation or provide public exploit status.
Researcher notes
The record lacks CWE mapping, exact version ranges, CPEs, and exploit-status detail. Analysis should stay anchored to AMD-SB-4001 and OEM firmware mappings before declaring a specific device vulnerable or remediated.
Mitigation direction
- Review AMD-SB-4001 for affected platform and firmware guidance.
- Inventory listed AMD Ryzen and Threadripper systems in server and endpoint fleets.
- Check OEM BIOS or firmware releases containing updated AGESA components.
- Prioritize updates on internet-exposed, shared, or high-value systems.
- If exact applicability is unclear, open a vendor/OEM support case.
Validation and detection
- Identify CPU platform, motherboard or device model, and current BIOS/firmware version.
- Map systems against AMD-SB-4001 and OEM firmware advisories.
- Confirm whether installed firmware contains the remediated AGESA level.
- Verify update completion through firmware inventory or endpoint management records.
- Track exceptions where OEM guidance is unavailable or unsupported.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-46773 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.