CVE-2025-20752

Device crash via missing modem bounds check

Published Dec 2, 2025 · Updated Feb 17, 2026

Reachable assertion in MediaTek Modem NR15 through NR17R allows physically proximate attackers to crash a device via a rogue base station. The modem fails to validate an input boundary before reaching an assertion, terminating the system instead of rejecting the input. Exploitation requires the user equipment to connect to an attacker-controlled rogue base station; no privileges or user interaction are required, and the reported consequence is a crash rather than code execution.

CVSS severity6.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reachable assertion in MediaTek Modem NR15 through NR17R allows physically proximate attackers to crash a device via a rogue base station. The modem fails to validate an input boundary before reaching an assertion, terminating the system instead of rejecting the input. Exploitation requires the user equipment to connect to an attacker-controlled rogue base station; no privileges or user interaction are required, and the reported consequence is a crash rather than code execution.

The record

CVE
CVE-2025-20752
Published
Dec 2, 2025
Updated
Feb 17, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo