Security readout for executives and security teams
Plain-English summary
CVE-2021-46767 is an AMD EPYC platform firmware issue in the AMD Secure Processor. A person with physical access may be able to write to memory without authorization, risking system integrity or denial of service. The public bundle rates it medium, with high integrity and availability impact but physical access required.
Executive priority
Treat this as a moderate firmware risk. It is unlikely to drive emergency remote-response work, but it should be included in server firmware maintenance, especially for EPYC systems outside tightly controlled facilities.
Technical view
The issue is insufficient input validation in AMD ASP/AGESA affecting listed AMD 2nd Gen and 3rd Gen EPYC platforms. CVSS 3.1 is 6.1 with physical attack vector, low complexity, no privileges, no user interaction, no confidentiality impact, and high integrity and availability impact.
Likely exposure
Exposure is most likely in servers using AMD 2nd or 3rd Gen EPYC platforms with AGESA firmware versions covered by AMD-SB-1032. Systems in controlled datacenters have reduced practical exposure, but shared, edge, lab, or physically accessible environments deserve faster review.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The CVSS vector requires physical access, so this is not described as a remote internet-facing issue. Impact still matters where attackers, insiders, contractors, or untrusted users can access hardware.
Researcher notes
The bundle identifies CWE-20 and physical access memory-write risk, but does not include exact vulnerable AGESA build ranges or fixed versions. Validate against AMD-SB-1032 and OEM mappings before declaring systems affected or remediated.
Mitigation direction
- Review AMD-SB-1032 and OEM firmware guidance for affected EPYC platforms.
- Update BIOS/firmware/AGESA through approved server vendor channels where applicable.
- Prioritize physically accessible, shared, colocated, or edge systems first.
- Maintain datacenter physical access controls and tamper monitoring.
- Track AMD and OEM advisories for fixed firmware details.
Validation and detection
- Inventory AMD 2nd Gen and 3rd Gen EPYC servers.
- Record BIOS, firmware, and AGESA versions from hardware management tooling.
- Compare versions against AMD-SB-1032 and OEM advisories.
- Confirm updates were applied through post-change firmware inventory.
- Review physical access logs for higher-risk server locations.
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-20: 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-2021-46767 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:P/AC:L/PR:N/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:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H0.95.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032CVE 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.