CVE-2021-26370

Improper validation of destination address in SVC_LOAD_FW_IMAGE_BY_INSTANCE and...

7.1 High

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: High

Exploit likelihood

0.23%Down 0.7 points since May 11, 2022

What each source reports

NVD Score used 7.1

Record: CVE-2021-26370
CVSS 3.1: 7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CVSS 2.0: 6.6 MediumAV:L/AC:L/Au:N/C:N/I:C/A:C
Weakness: CWE-20
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-26370
Weakness: CWE-20
Updated: 2026-11-02

EUVDEUVD-2021-13176 No score

Record: EUVD-2021-13176
Updated: 2026-11-03

GitHub AdvisoriesGHSA-9hr4-cwvw-3xm2 7.1

Improper validation of destination address in SVC_LOAD_FW_IMAGE_BY_INSTANCE and...

Record: GHSA-9hr4-cwvw-3xm2
CVSS 3.1: 7.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Weakness: CWE-20
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-26370 is a high vulnerability (CVSS 7.1) in Amd 2nd Gen Amd Epyc™, published May 10, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.23%, the 14th percentile. No source names a fixed version.