CVE-2021-26331 — AMD System Management Unit (SMU) contains a potential issue where a malicious user may be able to manipulate mailbox entries leading to arbitrary code execution

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HIGH

AMD System Management Unit (SMU) contains a potential issue where a malicious user may be able to manipulate mailbox entries leading to arbitrary code execution

Published Nov 16, 2021

7.8

HIGH

CVSS 3.1

EPSS 0.29%

Description

AMD System Management Unit (SMU) contains a potential issue where a malicious user may be able to manipulate mailbox entries leading to arbitrary code execution.

Affected products

Vendor AMD Product 1st Gen AMD EPYC™ Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <NaplesPI-SP3_1.0.0.G
Vendor AMD Product 2nd Gen AMD EPYC™ Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <RomePI-SP3_1.0.0.C
Vendor AMD Product 3rd Gen AMD EPYC™ Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <MilanPI-SP3_1.0.0.4

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

AMD

1st Gen AMD EPYC™

n/a

Version	Status	Constraints
unspecified	affected	<NaplesPI-SP3_1.0.0.G

AMD

2nd Gen AMD EPYC™

n/a

Version	Status	Constraints
unspecified	affected	<RomePI-SP3_1.0.0.C

AMD

3rd Gen AMD EPYC™

n/a

Version	Status	Constraints
unspecified	affected	<MilanPI-SP3_1.0.0.4

Remediation

No remediation recorded yet.

Metrics

0.29% 0.00295

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00295

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3
EPSS v4

Table of values (13 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.29% (0.00295)	19.97th	v5 (v2026.06.15)
Jun 15, 2026	0.29% (0.00285)	20.02th	v5 (v2026.06.15)
Mar 17, 2025	0.09% (0.00089)	23.35th	v4 (v2025.03.14)
Dec 12, 2024	0.04% (0.00044)	14.58th	v3 (v2023.03.01)
May 25, 2024	0.04% (0.00044)	12.27th	v3 (v2023.03.01)
Sep 3, 2023	0.04% (0.00044)	10.26th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00042)	5.63th	v3 (v2023.03.01)
Mar 6, 2023	1.04% (0.01036)	43.31th	v2 (v2022.01.01)
Apr 1, 2022	1.04% (0.01036)	39.16th	v2 (v2022.01.01)
Mar 31, 2022	2.76% (0.02763)	64.64th	v2 (v2022.01.01)
Jan 6, 2022	3.20% (0.03197)	66.14th	v1
Jan 5, 2022	0.73% (0.00731)	50.76th	v5 (v2026.06.15)
Nov 17, 2021	0.73% (0.00731)	50.13th	v1

Weaknesses (1)

CWE-20

Improper Input Validation

References (1)

https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021
x_refsource_MISCVendor Advisory

Link	Providers	Tags
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021		x_refsource_MISCVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner AMD

Published Nov 16, 2021

Updated Sep 16, 2024

Reserved Jan 29, 2021

Link CVE-2021-26331

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2021-26331

Red Hat

Severity n/a

Public date n/a

Links CVE-2021-26331