System-privileged escalation via insecure default value
Published Nov 4, 2025 · Updated Nov 4, 2025
Improper authentication in MediaTek Preloader allows local users with System privilege to escalate privileges through an insecure default value. The vendor identifies the locus only as preloader and the cause only as an insecure default value; no finer code-level operation is public. Exploitation is local, requires prior System privilege, needs no user interaction, and can compromise confidentiality, integrity, and availability.
Summary
What happened
Improper authentication in MediaTek Preloader allows local users with System privilege to escalate privileges through an insecure default value. The vendor identifies the locus only as preloader and the cause only as an insecure default value; no finer code-level operation is public. Exploitation is local, requires prior System privilege, needs no user interaction, and can compromise confidentiality, integrity, and availability.
The record
- CVE
- CVE-2025-20730
- Published
- Nov 4, 2025
- Updated
- Nov 4, 2025
- Vendor
- MediaTek
- Product
- MediaTek Preloader
- Classifications
- CWE-287, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Nov 4, 2025CVE publishedPublication date reported by the CVE source.
- 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Android 13.0, 14.0, 15.0, 16.0 / openWRT 21.02, 23.05 / Yocto 4.0 / RDK-B 24Q1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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