CVE-2021-26402
7.1 · HIGHOverview
CVE-2021-26402 is a high-severity vulnerability affecting amd epyc_7h12_firmware. It was published on January 11, 2023 and has a CVSS 3.1 base score of 7.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from amd. Update epyc_7h12_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_7h12_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7f72_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7f52_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7f32_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7742_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7702p_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7702_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7662_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7642_firmware | >= 0, < romepi_1.0.0.c | Affected |
| amd | epyc_7552_firmware | >= 0, < romepi_1.0.0.c | Affected |
Frequently Asked Questions
What is CVE-2021-26402?
CVE-2021-26402 is a high-severity vulnerability affecting amd epyc_7h12_firmware. It was published on January 11, 2023 and has a CVSS 3.1 base score of 7.1 (HIGH).
How severe is CVE-2021-26402?
This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-26402?
Check the references section for vendor advisories and patches from amd. Update epyc_7h12_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-2021-26402?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-26402 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.
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Browser-based exploitation validates findings with real proof-of-concept.
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