What is CVE-2026-20419?

CVE-2026-20419 is a medium-severity vulnerability in Mediatek Mt6890, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 6.5/10. Published 2026-02-02.

How severe is CVE-2026-20419?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Mediatek Mt6890

CVE-2026-20419

In wlan AP/STA firmware, there is a possible system becoming irresponsive due to an uncaught exception. This could lead to remote (proximal/adjacent) denial of service with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00461663 / WCNCR00463309; Issue ID: MSV-4852.

Published 2026-02-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.000

Affected products

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

corp.mediatek.com/product-security-bulletin/February-2026 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-20419?: CVE-2026-20419 is a medium-severity vulnerability in Mediatek Mt6890, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 6.5/10. Published 2026-02-02.
How severe is CVE-2026-20419?: Medium severity. CVSS v3 base score is 6.5 out of 10.