CVE-2025-20758Network attack vector

System crash via uncaught exception

Published Dec 2, 2025 · Updated Dec 2, 2025

Uncaught exception handling in MediaTek Modem NR15, NR16, NR17, and NR17R allows remote attackers to crash a UE through a rogue base station. MediaTek identifies the mechanism only as an exception that the modem does not catch and has not disclosed the triggering input or code locus. Exploitation requires connection to an attacker-controlled rogue base station, needs no device execution privileges or user interaction, and causes an availability-only system crash.

CVSS severity4.9
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught exception handling in MediaTek Modem NR15, NR16, NR17, and NR17R allows remote attackers to crash a UE through a rogue base station. MediaTek identifies the mechanism only as an exception that the modem does not catch and has not disclosed the triggering input or code locus. Exploitation requires connection to an attacker-controlled rogue base station, needs no device execution privileges or user interaction, and causes an availability-only system crash.

The record

CVE
CVE-2025-20758
Published
Dec 2, 2025
Updated
Dec 2, 2025
Vendor
MediaTek
Product
MediaTek Modem
Classifications
CWE-248
Attack vector
network
Privileges
unauthenticated

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?

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

  1. Affected versionversion=Modem NR15, NR16, NR17, NR17R

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MediaTek · MediaTek Modemversion=Modem NR15, NR16, NR17, NR17R

Published CVSS scores

4.9CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-248Uncaught Exception

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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