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CVE-2021-26356

UNKNOWN
Published 2023-05-09T18:58:48.108Z
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Expert Analysis

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CVSS Score

V3.1
7.4
/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.001
probability
of exploitation in the wild

There is a 0.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.343
Higher than 34.3% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
HIGH
Availability
NONE

Description

A TOCTOU in ASP bootloader may allow an attacker
to tamper with the SPI ROM following data read to memory potentially resulting
in S3 data corruption and information disclosure.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

AMD

Ryzen™ 3000 Series Desktop Processors “Matisse” AM4

Affected Versions:

various
AMD

AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4

Affected Versions:

various
AMD

3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT

Affected Versions:

various
AMD

Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS

Affected Versions:

various
AMD

Ryzen™ Threadripper™ PRO Processors “Chagall” WS

Affected Versions:

various
AMD

1st Gen AMD EPYC™ Processors

Affected Versions:

various
AMD

2nd Gen AMD EPYC™ Processors

Affected Versions:

various
AMD

3rd Gen AMD EPYC™ Processors

Affected Versions:

various

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-8c2m-2hmv-32px

Advisory Details

A TOCTOU in ASP bootloader may allow an attacker to tamper with the SPI ROM following data read to memory potentially resulting in S3 data corruption and information disclosure.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-26356
WEB https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001
WEB https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001

Advisory provided by GitHub Security Advisory Database. Published: May 9, 2023, Modified: April 4, 2024

References

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001
Published: 2023-05-09T18:58:48.108Z
Last Modified: 2025-01-28T15:48:38.470Z
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