What’s Vulnerable › Vulnerabilities

CVE-2021-26943

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-03-31 · updated 2026-06-17

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).

Affected products

• ASUS Ux360Ca Bios: before 304 — fixed in 304

How to fix

Upgrade to a fixed version: ASUS Ux360Ca Bios 304. Check the vendor advisory for mitigations.

References

• https://www.asus.com/support/FAQ/1045541/
• https://www.youtube.com/watch?v=1H3AfaVyeuk
• https://www.asus.com/support/FAQ/1045541/
• https://www.youtube.com/watch?v=1H3AfaVyeuk

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