CVE-2021-26356
7.4 · HIGHOverview
CVE-2021-26356 is a high-severity vulnerability affecting amd epyc_7001_firmware. It was published on May 9, 2023 and has a CVSS 3.1 base score of 7.4 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from amd. Update epyc_7001_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| amd | epyc_7001_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7251_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7261_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7281_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7301_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7351_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7351p_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7371_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7401_firmware | >= 0, < naplespi_1.0.0.h | Affected |
| amd | epyc_7401p_firmware | >= 0, < naplespi_1.0.0.h | Affected |
Frequently Asked Questions
What is CVE-2021-26356?
CVE-2021-26356 is a high-severity vulnerability affecting amd epyc_7001_firmware. It was published on May 9, 2023 and has a CVSS 3.1 base score of 7.4 (HIGH).
How severe is CVE-2021-26356?
This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-26356?
Check the references section for vendor advisories and patches from amd. Update epyc_7001_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-26356?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-26356 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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