CVE-2025-20747

Local privilege escalation via GNSS stack overflow

Published Nov 4, 2025 · Updated Nov 4, 2025

A stack overflow in the GNSS service on affected MediaTek chipsets allows local users with System privilege to elevate privileges. The GNSS service applies an incorrect bounds check before writing to a stack buffer, allowing data to be written beyond the buffer. Exploitation requires preexisting System privilege and no user interaction, and successful memory corruption grants higher local privilege.

CVSS severity6.7
Medium
EPSS probability0.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stack overflow in the GNSS service on affected MediaTek chipsets allows local users with System privilege to elevate privileges. The GNSS service applies an incorrect bounds check before writing to a stack buffer, allowing data to be written beyond the buffer. Exploitation requires preexisting System privilege and no user interaction, and successful memory corruption grants higher local privilege.

The record

CVE
CVE-2025-20747
Published
Nov 4, 2025
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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 vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.7CISA ADPCVSS:3.1/AV:L/AC:L/PR:H/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.

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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-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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