CVE-2021-26402 | BDVDB-2026-192552 Detail

AMD2nd Gen EPYC

Description#

Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of integrity and availability.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact high, availability impact high. Attack vector: local.

Weaknesses#

CWE-787 Out-of-bounds Write

References#

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032

Exploit#

No public exploit known

History#

Version 12023-01-10Record published in the CVE List.
Version 22025-04-08Most recent update recorded in the CVE List.

Published

Published: 2023-01-10
Last modified: 2025-04-08

Vendor information

Vendor: AMD
Product: 2nd Gen EPYC

All AMD vulnerabilities

Score

7.1 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 8.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
Various
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.1 High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Metric breakdown
Attack Vector	Local
Attack Complexity	Low
Privileges Required	Low
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	High
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).