How severe is CVE-2026-20423?

CVE-2026-20423 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-20423 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20423?

CVE-2026-20423 affects Mediatek Nbiot Sdk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-20423?

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.

Does CVE-2026-20423 have an EU (EUVD) identifier?

Yes. CVE-2026-20423 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9151.

When was CVE-2026-20423 published?

CVE-2026-20423 was published on 2026-03-02 and last updated on 2026-06-17.

CVE-2026-20423

CVE-2026-20423 is a high-severity vulnerability in Mediatek Nbiot Sdk with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9151
Weakness: CWE-787
Affected product: Mediatek Nbiot Sdk
Published: 2026-03-02
Last modified: 2026-06-17

Description

In wlan STA driver, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00465314; Issue ID: MSV-4956.

Frequently asked questions

What is CVE-2026-20423?: In wlan STA driver, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00465314; Issue ID: MSV-4956.
How severe is CVE-2026-20423?: CVE-2026-20423 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-20423 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20423?: CVE-2026-20423 affects Mediatek Nbiot Sdk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-20423?: 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.
Does CVE-2026-20423 have an EU (EUVD) identifier?: Yes. CVE-2026-20423 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9151.
When was CVE-2026-20423 published?: CVE-2026-20423 was published on 2026-03-02 and last updated on 2026-06-17.

References

https://corp.mediatek.com/product-security-bulletin/March-2026

Affected products (1)

cpe:2.3:a:mediatek:nbiot_sdk:*:*:*:*:*:*:*:*

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