CVE-2025-20761

Adjacent service crash via incorrect error handling

Published Jan 6, 2026 · Updated Jan 6, 2026

Improper exceptional-condition handling in MediaTek Modem NR15, NR16, and NR17 allows remote attackers to crash the system. MediaTek has not disclosed the specific modem routine or exceptional condition; it states only that incorrect error handling causes the crash. Exploitation requires a UE to connect to an attacker-controlled rogue base station, needs no privileges or user interaction, and interrupts service.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exceptional-condition handling in MediaTek Modem NR15, NR16, and NR17 allows remote attackers to crash the system. MediaTek has not disclosed the specific modem routine or exceptional condition; it states only that incorrect error handling causes the crash. Exploitation requires a UE to connect to an attacker-controlled rogue base station, needs no privileges or user interaction, and interrupts service.

The record

CVE
CVE-2025-20761
Published
Jan 6, 2026
Updated
Jan 6, 2026
Vendor
MediaTek
Product
MediaTek Modem
Classifications
CWE-754, T1642
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Modem NR15, NR16, NR17

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

MediaTek · MediaTek Modemversion=Modem NR15, NR16, NR17

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-754Improper Check for Unusual or Exceptional Conditions
T1642Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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