CVE-2021-46756 Denial of service in 1st Gen AMD EPYC™ Processors
Attackers with malicious Uapp or ABL can send malformed syscalls to the AMD Secure Processor bootloader, causing denial of service and integrity loss.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-46756?
CVE-2021-46756 is a critical denial of service vulnerability in Amd Epyc 7232p Firmware, published on 9 May 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Insufficient validation of inputs in SVC_MAP_USER_STACK in the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious Uapp or ABL to send malformed or invalid syscall to the bootloader resulting in a potential denial of service and loss of integrity.
Weakness: CWE-20
Which versions are affected by CVE-2021-46756?
It affects 63 products.
Products include Amd Epyc 7232p Firmware, Amd Epyc 7251 Firmware, Amd Epyc 7252 Firmware, Amd Epyc 7261 Firmware, Amd Epyc 7262 Firmware, Amd Epyc 7272 Firmware and 57 more.
How do I fix CVE-2021-46756?
No fix has been published for CVE-2021-46756 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-46756 being exploited?
There is no known exploitation of CVE-2021-46756 in the wild and no public exploit code.
Other vulnerabilities in Amd Epyc 7232p Firmware
Sources
Also known as GHSA-p57x-q6x3-v235.