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TI-2021-21503 Aliases CVE-2021-46791GHSA-669j-rxfq-2fvw

Out-of-bounds write in AMD 3rd Gen EPYC

Priority LOW 24CWE-787Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

Insufficient input validation during parsing of the System Management Mode (SMM) binary may allow a maliciously crafted SMM executable binary to corrupt Dynamic Root of Trust for Measurement (DRTM) user application memory that may result in a potential denial of service.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00186 8th percentileScored 2026-11-08
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AMD3rd Gen EPYCvarious —No fix listedCNA
  • 3rd Gen EPYC VendorAMD Affected various Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:amd:milanpi_firmware:*:*:*:*:*:*:*:*before 1.0.0.3VulnerableAMD
cpe:2.3:h:amd:milanpi:-:*:*:*:*:*:*:*not specified by NVDRunning onAMD
  • cpe:2.3:o:amd:milanpi_firmware:*:*:*:*:*:*:*:* Versions before 1.0.0.3 Vulnerable ·AMD
  • cpe:2.3:h:amd:milanpi:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·AMD

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-46791
  2. 2026-10-03 Alias added: GHSA-669j-rxfq-2fvw

References

Advisory 1

  • TI-2021-08226 Buffer overflow in AMD 3rd Gen EPYC CVSS 3.1HIGH 7.8
  • TI-2023-06994 Improper input validation in AMD 2nd Gen EPYC CVSS 3.1HIGH 7.5
  • TI-2021-21492 Out-of-bounds write in AMD 1st Gen EPYC CVSS 3.1HIGH 7.1
  • TI-2021-21483 Improper input validation in AMD 2nd Gen EPYC CVSS 3.1MEDIUM 6.1
  • TI-2021-21484 Out-of-bounds read in AMD 2nd Gen EPYC CVSS 3.1MEDIUM 5.5
  • TI-2023-06991 Use after free in AMD 3rd Gen AMD EPYC™ Processors CVSS 3.1LOW 3.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences