High severity · published May 9, 2023
CVE-2021-46755
Failure to unmap certain SysHub mappings in error paths of the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious bootloader to exhaust the SysHub…
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
Failure to unmap certain SysHub mappings in
error paths of the ASP (AMD Secure Processor) bootloader may allow an attacker
with a malicious bootloader to exhaust the SysHub resources resulting in a
potential denial of service.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
3G
3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT · AMD
various · source: vendor
AR
AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4 · AMD
various · source: vendor
R3
Ryzen™ 3000 Series Desktop Processors “Matisse” AM4 · AMD
various · source: vendor
R3
Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics “Renoir” · AMD
various · source: vendor
R5
Ryzen™ 5000 Series Desktop processor with Radeon™ Graphics “Cezanne” AM4 · AMD
various · source: vendor
R5
Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne” · AMD
various · source: vendor
R5
Ryzen™ 5000 Series Mobile processors with Radeon™ Graphics “Cezanne” · AMD
various · source: vendor
RT
Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS · AMD
various · source: vendor
RT
Ryzen™ Threadripper™ PRO Processors “Chagall” WS · AMD
various · source: vendor
R3
Ryzen 3100 Firmware · Amd
comboam4_v2_pi_1.2.0.8; comboam4pi_1.0.0.9 · source: NVD
R3
Ryzen 3300x Firmware · Amd
comboam4_v2_pi_1.2.0.8; comboam4pi_1.0.0.9 · source: NVD
R3
Ryzen 3500 Firmware · Amd
comboam4_v2_pi_1.2.0.8; comboam4pi_1.0.0.9 · source: NVD
Affected product
3G
3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT
AMD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-46755
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-46755
Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001
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