CVE-2021-26387
AMD ASP UEFI Shell Privilege Escalation Vulnerability
Description
Insufficient access controls in ASP kernel may allow a privileged attacker with access to AMD signing keys and the BIOS menu or UEFI shell to map DRAM regions in protected areas, potentially leading to a loss of platform integrity.
INFO
Published Date :
Aug. 13, 2024, 5:15 p.m.
Last Modified :
June 17, 2026, 3:43 a.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2021-26387
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | LOW | [email protected] |
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-26387.
| URL | Resource |
|---|---|
| https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3003.html | |
| https://www.amd.com/en/resources/product-security/bulletin/amd-sb-5002.html |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-26387 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-26387
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-26387 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-26387 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'AMD', 'product': 'AMD EPYC™ 7001 Series Processors', 'versions': [{'status': 'affected', 'version': 'various', 'versionType': 'PI'}], 'packageName': 'PI', 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD EPYC™ 7002 Series Processors', 'versions': [{'status': 'affected', 'version': 'various'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD EPYC™ 7003 Series Processors', 'versions': [{'status': 'affected', 'version': 'various'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD EPYC™ 9004 Series Processors', 'versions': [{'status': 'affected', 'version': 'various'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 3000 Series Desktop Processors', 'versions': [{'status': 'unaffected', 'version': 'ComboAM4PI 1.0.0.9'}, {'status': 'unaffected', 'version': 'ComboAM4 V2 PI 1.2.0.8'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 5000 Series Desktop Processors', 'versions': [{'status': 'unaffected', 'version': 'ComboAM4 V2 PI 1.2.0.8'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'ComboAM4v2 PI 1.2.0.6'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 7000 Series Desktop Processors', 'versions': [{'status': 'unaffected', 'version': 'ComboAM5 1.0.8.0'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'ComboAM4PI 1.0.0.9'}, {'status': 'unaffected', 'version': 'ComboAM4v2 PI 1.2.0.8'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'ComboAM4v2 PI 1.2.0.5'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Threadripper™ 3000 Series Processors', 'versions': [{'status': 'unaffected', 'version': 'CastlePeakPI-SP3r3 1.0.0.7'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors', 'versions': [{'status': 'unaffected', 'version': 'ChagallWSPI-sWRX8 1.0.0.2'}, {'status': 'unaffected', 'version': 'CastlePeakWSPI-sWRX8 1.0.0.9'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Threadripper™ PRO 5000WX Processors', 'versions': [{'status': 'unaffected', 'version': 'ChagallWSPI-sWRX8 1.0.0.2'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'PicassoPI-FP5 1.0.0.E'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'PollockPI-FT5 1.0.0.4'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 3000 Series Mobile Processor with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'PicassoPI-FP5 1.0.0.E'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'RenoirPI-FP6 1.0.0.8'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'CezannePI-FP6 1.0.0.9'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'CezannePI-FP6 1.0.0.9'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'RembrandtPI-FP7 1.0.0.9b'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'RembrandtPI-FP7 1.0.0.9b'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'CezannePI-FP6 1.0.0.9'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics', 'versions': [{'status': 'unaffected', 'version': 'CezannePI-FP6 1.0.0.9'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD EPYC™ Embedded 3000 Series Processors', 'versions': [{'status': 'affected', 'version': 'various'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD EPYC™ Embedded 7002 Series Processors', 'versions': [{'status': 'affected', 'version': 'various'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD EPYC™ Embedded 7003 Series Processors', 'versions': [{'status': 'affected', 'version': 'various'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD EPYC™ Embedded 9003 Series Processors', 'versions': [{'status': 'affected', 'version': 'various'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Embedded R1000 Series Processors', 'versions': [{'status': 'unaffected', 'version': 'EmbeddedPI-FP5 1.2.0.A'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Embedded R2000 Series Processors', 'versions': [{'status': 'unaffected', 'version': 'EmbeddedR2KPI-FP5 1.0.0.2'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Embedded 5000 Series Processors', 'versions': [{'status': 'unaffected', 'version': 'EmbAM4PI 1.0.0.2'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Embedded V1000 Series Processors', 'versions': [{'status': 'unaffected', 'version': 'EmbeddedPI-FP5 1.2.0.A'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Embedded V2000 Series Processors', 'versions': [{'status': 'unaffected', 'version': 'EmbeddedPI-FP6 1.0.0.6'}], 'defaultStatus': 'affected'}, {'vendor': 'AMD', 'product': 'AMD Ryzen™ Embedded V3000 Series Processors', 'versions': [{'status': 'unaffected', 'version': 'EmbeddedPI-FP7r2 1.0.0.9'}], 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2021-26387', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2024-08-14T15:47:34.441746Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 30, 2024
Action Type Old Value New Value Added CWE CISA-ADP CWE-863 -
CVE Received by [email protected]
Aug. 13, 2024
Action Type Old Value New Value Added Description Insufficient access controls in ASP kernel may allow a privileged attacker with access to AMD signing keys and the BIOS menu or UEFI shell to map DRAM regions in protected areas, potentially leading to a loss of platform integrity. Added Reference Advanced Micro Devices Inc. https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3003.html [No types assigned] Added Reference Advanced Micro Devices Inc. https://www.amd.com/en/resources/product-security/bulletin/amd-sb-5002.html [No types assigned] Added CVSS V3.1 Advanced Micro Devices Inc. AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:L