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Vulnerability record · CVE-2021-26370 · published 10 May 2022

CVE-2021-26370: Amd epyc 7763 firmware improper input validation vulnerability

AAmd · Epyc 7763 Firmware

Improper validation of destination address in SVC_LOAD_FW_IMAGE_BY_INSTANCE and SVC_LOAD_BINARY_BY_ATTRIB in a malicious UApp or ABL may allow an attacker to overwrite arbitrary bootloader memory with SPI ROM contents resulting in a loss of integrity and availability.

7.1 CVSS 3.1 High EPSS 0.23% · top 87.1% CWE-20 · Improper input validation
7.1CVSS 3.1 base score, v2 6.6
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
49Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Improper validation of destination address in SVC_LOAD_FW_IMAGE_BY_INSTANCE and SVC_LOAD_BINARY_BY_ATTRIB in a malicious UApp or ABL may allow an attacker to overwrite arbitrary bootloader memory with SPI ROM contents resulting in a loss of integrity and availability.

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

Affected products

49 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021 Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-26370), CISA KEV, FIRST EPSS (scores of 2026-10-13). This page is refreshed as NVD updates the record.