CVE-2025-20754Network attack vector

System crash via incorrect modem bounds check

Published Dec 2, 2025 · Updated Dec 2, 2025

Uncaught exception in MediaTek Modem NR15, NR16, NR17, and NR17R allows remote attackers to crash a device through a rogue base station. The modem applies an incorrect bounds check to attacker-controlled cellular input, triggering an uncaught exception that terminates the system. Exploitation requires the device to connect to an attacker-controlled base station; no user interaction is required, and the reported impact is a system crash.

CVSS severity5.3
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception in MediaTek Modem NR15, NR16, NR17, and NR17R allows remote attackers to crash a device through a rogue base station. The modem applies an incorrect bounds check to attacker-controlled cellular input, triggering an uncaught exception that terminates the system. Exploitation requires the device to connect to an attacker-controlled base station; no user interaction is required, and the reported impact is a system crash.

The record

CVE
CVE-2025-20754
Published
Dec 2, 2025
Updated
Dec 2, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2025Record 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 vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:H/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Application or System Exploitation

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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