Security readout for executives and security teams
Plain-English summary
This is a low-severity AMD server processor firmware issue. A highly privileged local attacker may be able to corrupt SRAM used by the System Management Unit, potentially causing limited integrity impact or denial of service. It is not described as remotely exploitable or actively exploited in the supplied sources.
Executive priority
Treat this as routine firmware risk management, not an emergency. Prioritize confirmation and scheduled remediation for critical AMD EPYC infrastructure, especially where local administrative access is broadly shared or difficult to control.
Technical view
CVE-2021-46762 is insufficient input validation in the AMD SMU affecting listed EPYC and EPYC Embedded platforms using AGESA. The CVSS vector requires local access, high attack complexity, and high privileges, with no user interaction and no confidentiality impact. Potential outcomes are SMU SRAM corruption, limited integrity loss, or availability impact.
Likely exposure
Exposure is most relevant to organizations running 2nd or 3rd Gen AMD EPYC, EPYC Embedded 7002, or EPYC Embedded 7003 systems with affected AGESA firmware. The supplied data says affected versions are “various,” so exact exposure requires checking AMD and OEM firmware guidance.
Exploitation context
The bundle does not show CISA KEV status or any cited active exploitation. The CVSS vector indicates an attacker needs local, highly privileged access and high attack complexity, making this more relevant after compromise or in tightly controlled administrative contexts than as an initial intrusion path.
Researcher notes
Evidence is limited to the CVE record and AMD advisories. The bundle does not provide CWE classification, exact fixed versions, exploit details, or active exploitation. Avoid broad product claims; validate AGESA and OEM firmware applicability before assigning exposure.
Mitigation direction
- Review AMD-SB-3001 and AMD-SB-5001 for affected AGESA and platform guidance.
- Check server OEM BIOS or firmware advisories for the same AMD bulletin mapping.
- Apply vendor-approved BIOS or firmware updates when your platform is listed as affected.
- Prioritize systems where untrusted users or workloads can obtain privileged local access.
Validation and detection
- Inventory AMD EPYC and EPYC Embedded systems in production and lab environments.
- Record current BIOS, firmware, and AGESA versions from vendor management tools.
- Compare platform firmware versions against AMD and OEM advisory guidance.
- Confirm no unsupported assumptions that all EPYC systems are affected.
- After remediation, verify firmware versions changed to vendor-recommended levels.
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-2021-46762 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
- Low
- CVSS
- 3.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:L
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:C/C:N/I:L/A:L0.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.9LowVector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001CVE reference · vendor-advisory
- https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-5001CVE 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.