UE crash via unchecked modem write
Published Jul 1, 2026 · Updated Jul 1, 2026
Out-of-bounds write in the MediaTek Chipset modem allows physically proximate attackers to crash a UE through a rogue base station. The modem omits a bounds check before writing data derived from base-station traffic outside the intended buffer; MediaTek has not disclosed the affected routine or message. Exploitation requires the UE to connect to an attacker-controlled base station, requires no privileges or user interaction, and affects availability only.
Summary
What happened
Out-of-bounds write in the MediaTek Chipset modem allows physically proximate attackers to crash a UE through a rogue base station. The modem omits a bounds check before writing data derived from base-station traffic outside the intended buffer; MediaTek has not disclosed the affected routine or message. Exploitation requires the UE to connect to an attacker-controlled base station, requires no privileges or user interaction, and affects availability only.
The record
- CVE
- CVE-2026-20461
- Published
- Jul 1, 2026
- Updated
- Jul 1, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-787, T1642
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 1, 2026CVE publishedPublication date reported by the CVE source.
- Jul 1, 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=MT2737
- Affected versionversion=MT6813
- Affected versionversion=MT6835
- Affected versionversion=MT6858
- Affected versionversion=MT6878
- Affected versionversion=MT6879
- Affected versionversion=MT6886
- Affected versionversion=MT6895
- Affected versionversion=MT6896
- Affected versionversion=MT6897
- Affected versionversion=MT6899
- Affected versionversion=MT6980
- Affected versionversion=MT6983
- Affected versionversion=MT6985
- Affected versionversion=MT6988
- Affected versionversion=MT6989
- Affected versionversion=MT6990
- Affected versionversion=MT6991
- Affected versionversion=MT6993
- Affected versionversion=MT8673
- Affected versionversion=MT8676
- Affected versionversion=MT8678
- Affected versionversion=MT8755
- Affected versionversion=MT8775
- Affected versionversion=MT8792
- Affected versionversion=MT8793
- Affected versionversion=MT8795T
- Affected versionversion=MT8796
- Affected versionversion=MT8798
- Affected versionversion=MT8863
- Affected versionversion=MT8873
- Affected versionversion=MT8883
- Affected versionversion=MT8893
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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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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