A malicious or compromised UApp or ABL can send a malformed system call to the bootloader, which may result in an out-of-bounds memory acce…

published 2023-05-09 3y ago modified 2026-06-17 4mo ago also EUVD-2021-33416

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits: 0; none known

A malicious or compromised UApp or ABL can send a malformed system call to the bootloader, which may result in an out-of-bounds memory access that may potentially lead to an attacker leaking sensitive information or achieving code execution.

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CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: last yr. (2025-01-27)

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

AMD 3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT
AMD Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS

Classification

Weakness

CWE-770 Allocation of Resources Without Limits or Throttling
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

amd.com /en/corporate/product-security/bulletin/AMD-SB-4001
vendor-advisory

Sources

CVE List CVE-2021-46760
NVD CVE-2021-46760

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