Low severity · published Jun 26, 2026
CVE-2023-20540
An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary…
1.8
CVSS
0.2%
EPSS
No
On KEV
Description
An observable timing discrepancy in the ASP could allow a privileged attacker to perform a brute-force attack against the hash message authentication code, allowing arbitrary message input, potentially leading to a loss of data integrity.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AR
AMD Ryzen™ 3000 Series Desktop Processors · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ 5000 Series Desktop Processors · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ Threadripper™ 3000 Series Processors · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ Threadripper™ PRO 5000 WX-Series Processors · AMD
All versions, or not specified · source: vendor
Affected product
AR
AMD Ryzen™ 3000 Series Desktop Processors
AMD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-20540
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-20540
www.amd.com
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-4012.html
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