Medium severity · published May 12, 2022
CVE-2021-26361
A malicious or compromised User Application (UApp) or AGESA Boot Loader (ABL) could be used by an attacker to exfiltrate arbitrary memory from the ASP stage 2 bootloader…
5.5
CVSS
0.2%
EPSS
No
On KEV
Description
A malicious or compromised User Application (UApp) or AGESA Boot Loader (ABL) could be used by an attacker to exfiltrate arbitrary memory from the ASP stage 2 bootloader potentially leading to information disclosure.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
A3
Athlon 3050ge Firmware · Amd
All versions, or not specified · source: NVD
A3
Athlon 3150g Firmware · Amd
All versions, or not specified · source: NVD
A3
Athlon 3150ge Firmware · Amd
All versions, or not specified · source: NVD
RS
Radeon Software · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 2200u Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 2300u Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 5125c Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 5400u Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 5425c Firmware · Amd
All versions, or not specified · source: NVD
R3
Ryzen 3 5425u Firmware · Amd
All versions, or not specified · source: NVD
R5
Ryzen 5 2500u Firmware · Amd
All versions, or not specified · source: NVD
R5
Ryzen 5 2600 Firmware · Amd
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26361
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-26361
Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027
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Failure to verify the protocol in SMM may allow an attacker to control the protocol and modify SPI flash resulting in a potential arbitrary code execution
7.8
CVE-2021-26369
A malicious or compromised UApp or ABL may be used by an attacker to send a malformed system call to the bootloader, resulting in out-of-bounds memory accesses
7.1
CVE-2021-26366
An attacker, who gained elevated privileges via some other vulnerability, may be able to read data from Boot ROM resulting in a loss of system integrity
7.1
CVE-2021-26362
A malicious or compromised UApp or ABL may be used by an attacker to issue a malformed system call which results in mapping sensitive System Management Network (SMN) registers…