How severe is CVE-2021-42299?

CVE-2021-42299 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over physical access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.

Is CVE-2021-42299 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42299?

CVE-2021-42299 affects Microsoft Surface Pro 3 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42299?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-42299 published?

CVE-2021-42299 was published on 2021-10-20 and last updated on 2026-06-17.

CVE-2021-42299

CVE-2021-42299 is a medium-severity vulnerability in Microsoft Surface Pro 3 Firmware with a CVSS 3.x base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.6)
CVSS v2: 3.6
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Surface Pro 3 Firmware
Published: 2021-10-20
Last modified: 2026-06-17

Description

Microsoft Surface Pro 3 Security Feature Bypass Vulnerability

Frequently asked questions

What is CVE-2021-42299?: Microsoft Surface Pro 3 Security Feature Bypass Vulnerability
How severe is CVE-2021-42299?: CVE-2021-42299 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over physical access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
Is CVE-2021-42299 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42299?: CVE-2021-42299 affects Microsoft Surface Pro 3 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42299?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-42299 published?: CVE-2021-42299 was published on 2021-10-20 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42299

Affected products (1)

cpe:2.3:o:microsoft:surface_pro_3_firmware:-:*:*:*:*:*:*:*