CVE-2026-20418Network attack vector

Remote privilege escalation via missing Thread bounds check

Published Feb 2, 2026 · Updated Feb 2, 2026

An out-of-bounds write in the Thread component of MediaTek MT7931 and MT7933 chipsets allows remote attackers to elevate privileges. MediaTek attributes the flaw to a missing bounds check but has not disclosed the affected routine or the attacker-controlled Thread field that overruns its destination. No authentication, additional execution privileges, or user interaction is required to reach the remote privilege boundary.

CVSS severity9.8
Critical
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in the Thread component of MediaTek MT7931 and MT7933 chipsets allows remote attackers to elevate privileges. MediaTek attributes the flaw to a missing bounds check but has not disclosed the affected routine or the attacker-controlled Thread field that overruns its destination. No authentication, additional execution privileges, or user interaction is required to reach the remote privilege boundary.

The record

CVE
CVE-2026-20418
Published
Feb 2, 2026
Updated
Feb 2, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

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

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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