Is CVE-2026-20403 actively exploited?

CVE-2026-20403 has no public evidence of in-the-wild exploitation as of 2026-02-17.

What is the CVSS score for CVE-2026-20403?

CVE-2026-20403 has a CVSS score of 6.5 (MEDIUM severity). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2026-20403?

Patch guidance is available from mediatek security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-20403.

CVE-2026-20403 - remediation guidance & executive summary

Q: Which products are affected by CVE-2026-20403?

4 products: mediatek nr15, mediatek nr16, mediatek nr17, mediatek nr17r.

Description

In Modem, there is a possible system crash due to a missing bounds check. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01689254 (Note: For N15 and NR16) / MOLY01689259 (Note: For NR17 and NR17R); Issue ID: MSV-4843.

CVSS Metrics

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: adjacent network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-787 · Out-of-bounds Write

Metadata

Primary Vendor: MEDIATEK
Published: 2/2/2026
Last Modified: 2/17/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

mediatek : nr15mediatek : nr16mediatek : nr17mediatek : nr17r

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-20403. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-20403

View on NIST NVD

CVE-2026-20403 vulnerability