CVE-2026-20490

Local device crash via unchecked ccci bounds

Published Aug 3, 2026 · Updated Aug 3, 2026

Out-of-bounds read in the ccci component of MediaTek chipsets allows local users with System privilege to crash the device. The ccci component fails to verify a boundary before reading memory, so crafted local input can access data beyond the intended buffer. System-level access is required, user interaction is unnecessary, and the established consequence is a local device crash rather than data disclosure or code execution.

CVSS severity4.4
Medium
EPSS probability0.10%
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 read in the ccci component of MediaTek chipsets allows local users with System privilege to crash the device. The ccci component fails to verify a boundary before reading memory, so crafted local input can access data beyond the intended buffer. System-level access is required, user interaction is unnecessary, and the established consequence is a local device crash rather than data disclosure or code execution.

The record

CVE
CVE-2026-20490
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
MediaTek
Product
MediaTek Chipset
Classifications
CWE-125, T1642
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

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

  1. Affected versionversion=MT6813
  2. Affected versionversion=MT6982VB
  3. Affected versionversion=MT6986
  4. Affected versionversion=MT6986D
  5. Affected versionversion=MT6988

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

MediaTek · MediaTek Chipsetversion=MT6813; version=MT6982VB; version=MT6986; version=MT6986D; version=MT6988

Published CVSS scores

4.4CISA-ADPCVSS:3.1/AV:L/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.

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No observations available

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

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1642Endpoint Denial of Service

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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