PT-2023-1486 · Amd · Amd Bios

Hugo Magalhaes · CVE-2021-26402 · Published 2023-01-10 · Updated 2025-04-08

Positive Technologies (AI Summary)

CVSS v3.1

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions AMD BIOS software (affected versions not specified)

Description The issue is related to insufficient bounds checking in the AMD Secure Processor firmware when handling BIOS mailbox commands. This can allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions, potentially leading to a loss of integrity and availability of protected information.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Corruption

Buffer Overflow

Weakness Enumeration

CWE-787

CWE-119

Related Identifiers

BDU:2023-00896

CVE-2021-26402

Affected Products

Amd Bios

References · 7

• https://amd.com/en/corporate/product-security/bulletin/AMD-SB-1032 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-26402 · Security Note
• https://bdu.fstec.ru/vul/2023-00896 · Security Note
• https://osv.dev/vulnerability/CVE-2021-26402 · Vendor Advisory
• https://amd.com/en/corporate/product-security/bulletin/amd-sb-1032 · Note
• https://t.me/cvenotify/118376 · Telegram Post
• https://support.lenovo.com/us/en/product_security/LEN-87730 · Note