CVE-2024-20149

Connectivity loss via zero-length NAS transport

Published Jan 6, 2025 · Updated Jan 6, 2025

Improper input validation in MediaTek Modem LR12A, LR13, NR15, NR16, NR17.R1, and NR17.R2 allows remote attackers to crash the baseband. The DL NAS Transport handler allocates a zero-length buffer for an empty payload, causing an assertion failure and forced crash. An unauthenticated over-the-air packet is sufficient to disable all cellular connectivity until the baseband restarts, without user interaction.

CVSS severity7.5
High
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in MediaTek Modem LR12A, LR13, NR15, NR16, NR17.R1, and NR17.R2 allows remote attackers to crash the baseband. The DL NAS Transport handler allocates a zero-length buffer for an empty payload, causing an assertion failure and forced crash. An unauthenticated over-the-air packet is sufficient to disable all cellular connectivity until the baseband restarts, without user interaction.

The record

CVE
CVE-2024-20149
Published
Jan 6, 2025
Updated
Jan 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1284, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/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 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-1284Improper Validation of Specified Quantity in Input
T1499Endpoint 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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