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

CVE-2026-20403 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Nr15 are affected by CVE-2026-20403?

CVE-2026-20403 presents notable security risk, a out-of-bounds write vulnerability rated CVSS 6.5. Exploitation could cause memory corruption or application crashes.

How to fix or mitigate CVE-2026-20403?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Nr15 CVE-2026-20403

MEDIUM

Out-of-bounds Write (CWE-787)

2026-02-02 security@mediatek.com

Denial Of Service Nr15 Nr16 Nr17 Nr17r

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:01 vuln.today

CVE Published

Feb 02, 2026 - 09:15 nvd

MEDIUM 6.5

DescriptionCVE.org

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.

AnalysisAI

Modem firmware versions Nr15, Nr16, Nr17, and Nr17r are susceptible to denial of service attacks due to insufficient bounds checking in memory operations. An attacker controlling a rogue base station can trigger a system crash on connected devices without requiring authentication or user interaction. No patch is currently available for this vulnerability.

Technical ContextAI

Classified as CWE-787 (Out-of-bounds Write). Affects Nr15. 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.