CVE-2024-20039Network attack vector

Remote code execution via unchecked modem message length

Published Apr 1, 2024 · Updated Aug 1, 2024

Out-of-bounds write in MediaTek Modem LR12A, LR13, NR15, NR16, and NR17 allows remote attackers to execute code via modem protocol input. The modem protocol handling path omits a bounds check before writing untrusted input, allowing a write beyond the intended buffer. Exploitation requires network reachability to an affected chipset's modem protocol; no user interaction or additional execution privileges are needed.

CVSS severity8.8
High
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in MediaTek Modem LR12A, LR13, NR15, NR16, and NR17 allows remote attackers to execute code via modem protocol input. The modem protocol handling path omits a bounds check before writing untrusted input, allowing a write beyond the intended buffer. Exploitation requires network reachability to an affected chipset's modem protocol; no user interaction or additional execution privileges are needed.

The record

CVE
CVE-2024-20039
Published
Apr 1, 2024
Updated
Aug 1, 2024
Vendor
MediaTek
Product
MediaTek Modem
Classifications
CWE-787, T1210
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record 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=0 <moly01240012

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

MediaTek · MediaTek Modemversion=0 <moly01240012

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1210Exploitation of Remote Services

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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