Home/CVE/In wlan AP/STA firmware, there is a possible system becoming irresponsive due to an uncaught exception. This could lead
CVE

CVE-2026-20419

In wlan AP/STA firmware, there is a possible system becoming irresponsive due to an uncaught exception. This could lead

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.

MEDIUM · CVSS 6.5 EPSS 0.00014
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-754Improper Check for Unusual or Exceptional Conditions
▤

Affected Products & Versions

3
mediatek nbiot sdk<= 3.6
mediatek software development kit<= 7.6.7.2
openwrtall versions
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · security@mediatek.com
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Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD02 Feb 2026 · 09:15 AM
CVSS VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://corp.mediatek.com/product-security-bulletin/February-2026Vendor Advisory
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