Medium severity · published Jan 10, 2023
CVE-2021-46795
A TOCTOU (time-of-check to time-of-use) vulnerability exists where an attacker may use a compromised BIOS to cause the TEE OS to read memory out of bounds that could potentially…
4.7
CVSS
0.1%
EPSS
No
On KEV
Description
A TOCTOU (time-of-check to time-of-use) vulnerability exists where an attacker may use a compromised BIOS to cause the TEE OS to read memory out of bounds that could potentially result in a denial of service.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
R3
Ryzen 3000 Series · AMD
various · source: vendor
R5
Ryzen 5000 Series · AMD
various · source: vendor
CF
Cezannepi-fp6 Firmware · Amd
before 1.0.0.6 · source: NVD
CP
Comboam4v2 PI Firmware · Amd
before 1.2.0.5 · source: NVD
RF
Renoirpi-fp6 Firmware · Amd
before 1.0.0.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-46795
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-46795
Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1031
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