CVE-2025-20647

Remote system crash via missing modem bounds check

Published Mar 3, 2025 · Updated Feb 17, 2026

Null pointer dereference in MediaTek Modem NR12A, NR13, NR15, and NR16 allows remote attackers to crash a device via a rogue base station. The modem omits a bounds check, allowing an out-of-range condition to cause a null pointer dereference and system crash. Exploitation requires connection to an attacker-controlled base station; no privileges or user interaction are required, and impact is limited to availability.

CVSS severity6.5
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in MediaTek Modem NR12A, NR13, NR15, and NR16 allows remote attackers to crash a device via a rogue base station. The modem omits a bounds check, allowing an out-of-range condition to cause a null pointer dereference and system crash. Exploitation requires connection to an attacker-controlled base station; no privileges or user interaction are required, and impact is limited to availability.

The record

CVE
CVE-2025-20647
Published
Mar 3, 2025
Updated
Feb 17, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1464
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1464Network Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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