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Nr15 CVE-2026-20401

HIGH
Reachable Assertion (CWE-617)
2026-02-02 security@mediatek.com
Denial Of Service Nr15
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:01 vuln.today
CVE Published
Feb 02, 2026 - 09:15 nvd
HIGH 7.5

DescriptionCVE.org

In Modem, there is a possible system crash due to an uncaught exception. 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: MOLY01738310; Issue ID: MSV-5933.

AnalysisAI

Nr15 modem suffers from an uncaught exception vulnerability that allows remote attackers to trigger a denial of service by connecting a device to a malicious base station. No special privileges or user interaction are required to exploit this network-based flaw. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Set up rogue base station
Delivery
UE connects to attacker-controlled station
Exploit
Send crafted modem message
Execution
Trigger uncaught exception
Impact
System crash and denial of service
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Vulnerability AssessmentAI

Exploitation User equipment (UE) must connect to attacker-controlled rogue base station. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.5 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A remote attacker could exploit this vulnerability to remote denial of service, if a UE has connected to a rogue base station controll.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all devices and assets using affected modem firmware and assess exposure in your organization. …

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CVE-2026-20401 vulnerability details – vuln.today
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