What is CVE-2021-46749?A high-severity flaw in Ryzen 5300g Firmware, explained.
CVE-2021-46749 is a high-severity flaw (CVSS 7.5) in Ryzen 5300g Firmware from Amd, published on 9 May 2023. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 0.6%. If you run an affected version, plan in the vendor’s fix.
Published 9 May 2023. Record last updated 28 January 2025. We keep this page's data up to date.
What is CVE-2021-46749? In plain terms.
It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.
Insufficient bounds checking in ASP (AMD Secure Processor) may allow for an out of bounds read in SMI (System Management Interface) mailbox checksum calculation triggering a data abort, resulting in a potential denial of service.
What kind of flaw is it?
- CWE-125Out-of-bounds Read
How an attack on it works
Read straight from its severity rating, translated out of the shorthand.
- Where an attacker can beAnywhere on the internet
- How hard it is to pull offEasy: no special conditions
- Login needed firstNo login needed
- Does someone have to clickNo, nobody has to do anything
- What an attacker getsCan take it offline
Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Is CVE-2021-46749 being exploited? Not that we know of.
It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.6%. That can change at any time, which is why we keep watching.
Timeline
- Published
- Record last updated
CVE-2021-46749 scores 47. Action: Plan remediation.
We keep the score of every published flaw up to date as the evidence changes. Four things go into the score, and evidence that criminals are actually using it counts most. In order:
- Evidence it is being exploitedBiggest factor
- How severe it isStrong factor
- How widely exposed it isSmaller factor
- Threat activity around itSmaller factor
85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score.
When CVE-2021-46749 matches software you track, it lands in your list with its score and the reasons behind it.
See your own ranked list →Who is affected by CVE-2021-46749? 112 products.
The published record lists 112 products from 1 vendor. If you run one of these, check your version, then go to the fix below.
- Operating system
Ryzen 5300g Firmware
by Amd
Affected versionscezannepi-fp6_1.0.0.8 - Operating system
Ryzen 3100 Firmware
by Amd
Affected versionscomboam4pi_1.0.0.9comboam4v2_pi_1.2.0.5comboam4v2_pi_1.2.0.8picassopi-fp5_1.0.0.erenoirpi-fp6_1.0.0.8 - Operating system
Ryzen 3300x Firmware
by Amd
Affected versionscomboam4pi_1.0.0.9comboam4v2_pi_1.2.0.5comboam4v2_pi_1.2.0.8picassopi-fp5_1.0.0.erenoirpi-fp6_1.0.0.8 - Operating system
Ryzen 3500 Firmware
by Amd
Affected versionscomboam4pi_1.0.0.9comboam4v2_pi_1.2.0.5comboam4v2_pi_1.2.0.8picassopi-fp5_1.0.0.erenoirpi-fp6_1.0.0.8 - Operating system
Ryzen 3500x Firmware
by Amd
Affected versionscomboam4pi_1.0.0.9comboam4v2_pi_1.2.0.5comboam4v2_pi_1.2.0.8picassopi-fp5_1.0.0.erenoirpi-fp6_1.0.0.8 - Operating system
Ryzen 3600 Firmware
by Amd
Affected versionscomboam4pi_1.0.0.9comboam4v2_pi_1.2.0.5comboam4v2_pi_1.2.0.8picassopi-fp5_1.0.0.erenoirpi-fp6_1.0.0.8 - Operating system
Ryzen 3600x Firmware
by Amd
Affected versionscomboam4pi_1.0.0.9comboam4v2_pi_1.2.0.5comboam4v2_pi_1.2.0.8picassopi-fp5_1.0.0.erenoirpi-fp6_1.0.0.8 - Operating system
Ryzen 3600xt Firmware
by Amd
Affected versionscomboam4pi_1.0.0.9comboam4v2_pi_1.2.0.5comboam4v2_pi_1.2.0.8picassopi-fp5_1.0.0.erenoirpi-fp6_1.0.0.8 - Operating system
Ryzen 3800x Firmware
by Amd
Affected versionscomboam4pi_1.0.0.9comboam4v2_pi_1.2.0.5comboam4v2_pi_1.2.0.8picassopi-fp5_1.0.0.erenoirpi-fp6_1.0.0.8
How do I fix CVE-2021-46749? Four steps.
- Check whether you run itCompare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
- Apply the vendor’s fixInstall the update named in the vendor’s advisory. We’ve put the advisory first in the list.
- If you can’t patch todayFollow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
- Keep an eye on itTrack the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood.
References
1 linkDoes CVE-2021-46749 affect you? We'll keep checking.
Looking flaws up one at a time doesn't scale. Tell us what you run once, and we tell you which flaws matter to you, in what order, and keep watching for new ones.
- Tell us what you runPick your software from a list, or let us work it out from your website.
- We match it to every flawOver 400,000 published flaws, checked against your list.
- Ranked by real-world riskA 0 to 100 score, led by evidence criminals are using it.
- Told as soon as we knowAn alert by email, in the app or by webhook to your own tools.
Free plan, no card needed. Nothing to install.
1 new flaw affects software Acme tracks
Insufficient bounds checking in ASP (AMD Secure Processor) may allow for an out of bounds read in SMI (System Management Interface) mailbox checksum calculat...
- Matched to
- Ryzen 5300g Firmware on Acme's software list
- What to do
- Plan in the vendor’s update
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
CVE-2021-46749 is a high-severity flaw in Ryzen 5300g Firmware from Amd, published on 9 May 2023. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.
It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2021-46749 is 47 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle.
It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.6%. That can change at any time, which is why we keep watching.
For Ryzen 5300g Firmware from Amd: cezannepi-fp6_1.0.0.8. The record lists 112 products in all, each with its versions, under "Who is affected" on this page.
Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet.