CVE-2026-20419 — Improper Check for Unusual or Exceptional Conditions in Nbiot SDK

CWE-754 — Improper Check for Unusual or Exceptional Conditions3 documents3 sources
Severity
6.5MEDIUMNVD
EPSS
0.0%
top 97.58%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Mediatek Nbiot SDKMediatek Software Development KITMediatek INC Mediatek Chipset+1 more
Timeline
PublishedFeb 2

Description

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.

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages4 packages

▶NVDopenwrt/openwrt19.07.0, 21.02.0+1
▶CVEListV5mediatek_inc/mediatek_chipset25 versions+24

🔴Vulnerability Details

2
CVEList
CVE-2026-20419: In wlan AP/STA firmware, there is a possible system becoming irresponsive due to an uncaught exception↗2026-02-02
▶
GHSA
GHSA-4q2v-rcwc-rv6w: In wlan AP/STA firmware, there is a possible system becoming irresponsive due to an uncaught exception↗2026-02-02
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CVE-2026-20419 — Mediatek Nbiot SDK vulnerability | cvebase