What is CVE-2021-46760?

CVE-2021-46760 is a critical-severity vulnerability in AMD 3rd Gen Ryzen™ Threadripper™ Processors “Castle Peak” Hedt, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2023-05-09.

How severe is CVE-2021-46760?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in AMD 3rd Gen Ryzen™ Threadripper™ Processors “Castle Peak” Hedt

CVE-2021-46760

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.

Vulnerability class: Buffer Overflow

Published 2023-05-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (55.3th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

AMD 3rd Gen Ryzen™ Threadripper™ Processors “Castle Peak” Hedt — versions various
AMD Ryzen 3945wx
AMD Ryzen 3945wx Firmware — versions castlepeakwspi-swrx8_1.0.0.9, chagallwspi-swrx8_1.0.0.2, castlepeakpi-sp3r3_1.0.0.7
AMD Ryzen 3955wx
AMD Ryzen 3955wx Firmware — versions castlepeakwspi-swrx8_1.0.0.9, chagallwspi-swrx8_1.0.0.2, castlepeakpi-sp3r3_1.0.0.7
AMD Ryzen 3960x
AMD Ryzen 3960x Firmware — versions castlepeakwspi-swrx8_1.0.0.9, chagallwspi-swrx8_1.0.0.2, castlepeakpi-sp3r3_1.0.0.7
AMD Ryzen 3970x
AMD Ryzen 3970x Firmware — versions castlepeakwspi-swrx8_1.0.0.9, chagallwspi-swrx8_1.0.0.2, castlepeakpi-sp3r3_1.0.0.7
AMD Ryzen 3975wx

Weakness classification (CWE)

References

www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-46760?: CVE-2021-46760 is a critical-severity vulnerability in AMD 3rd Gen Ryzen™ Threadripper™ Processors “Castle Peak” Hedt, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2023-05-09.
How severe is CVE-2021-46760?: Critical severity. CVSS v3 base score is 9.8 out of 10.