How severe is CVE-2021-26943?

CVE-2021-26943 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-26943 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26943?

CVE-2021-26943 affects Asus Ux360ca Bios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26943?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26943 published?

CVE-2021-26943 was published on 2021-03-31 and last updated on 2026-06-17.

CVE-2021-26943

CVE-2021-26943 is a high-severity vulnerability in Asus Ux360ca Bios with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v2: 7.2
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Asus Ux360ca Bios
Published: 2021-03-31
Last modified: 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).

Frequently asked questions

What is CVE-2021-26943?: 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).
How severe is CVE-2021-26943?: CVE-2021-26943 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-26943 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26943?: CVE-2021-26943 affects Asus Ux360ca Bios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26943?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-26943 published?: CVE-2021-26943 was published on 2021-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:asus:ux360ca_bios:*:*:*:*:*:*:*:*