Device identifier disclosure via preloader logic error
Published Mar 2, 2026 · Updated Mar 2, 2026
Information disclosure in MediaTek Preloader allows physically proximate attackers to read device unique identifiers from affected chipsets. MediaTek identifies a logic error in the preloader but has not disclosed the responsible routine, data path, or incorrect operation. Physical access is required; no execution privileges or user interaction are needed, and the reported impact is limited to identifier disclosure.
Summary
What happened
Information disclosure in MediaTek Preloader allows physically proximate attackers to read device unique identifiers from affected chipsets. MediaTek identifies a logic error in the preloader but has not disclosed the responsible routine, data path, or incorrect operation. Physical access is required; no execution privileges or user interaction are needed, and the reported impact is limited to identifier disclosure.
The record
- CVE
- CVE-2026-20435
- Published
- Mar 2, 2026
- Updated
- Mar 2, 2026
- Vendor
- MediaTek
- Product
- MediaTek Preloader
- Classifications
- CWE-522, T1005
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 2, 2026CVE publishedPublication date reported by the CVE source.
- Mar 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Android 14.0, 15.0, 16.0 / openWRT 21.02, 23.05 / Yocto 4.0 / RDK-B 22Q3, 24Q1 / Zephyr 3.7.0
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.
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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