CVE-2021-26943

Name: CVE-2021-26943
Creator: NVD / NIST
Published: 2021-03-31T20:15:14.13+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 0.94%

Last modified Jun 17, 2026

CVE-2021-26943 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. The UX360CA BIOS through 303 on ASUS laptops allow an attacker (with the ring 0 privilege) to overwrite nearly arbitrary physical memory locations, including SMRAM, and execute arbitrary code in the SMM (issue 3 of 3).. EPSS estimates a 0.94% chance of exploitation in the next 30 days.

Description

The UX360CA BIOS through 303 on ASUS laptops allow an attacker (with the ring 0 privilege) to overwrite nearly arbitrary physical memory locations, including SMRAM, and execute arbitrary code in the SMM (issue 3 of 3).

Metrics

CVSS 3.1

8.2/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.94%

56.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Asus	Ux360ca Bios	< 304

References

https://www.asus.com/support/FAQ/1045541/Exploit, Vendor Advisory
https://www.youtube.com/watch?v=1H3AfaVyeukExploit, Third Party Advisory
https://www.asus.com/support/FAQ/1045541/Exploit, Vendor Advisory
https://www.youtube.com/watch?v=1H3AfaVyeukExploit, Third Party Advisory

Timeline

Published: Mar 31, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26943?

How severe is CVE-2021-26943?

CVE-2021-26943 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 0.94% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26943?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26943?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST