Remote privilege escalation via modem bounds-check omission
Published Jul 1, 2026 · Updated Jul 1, 2026
Out-of-bounds write in the MediaTek Chipset modem allows attackers controlling a rogue base station to escalate privileges remotely. The modem omits a bounds check before writing data and corrupts memory, but MediaTek has not disclosed the affected function, buffer, or message field. Exploitation requires a UE to connect to the rogue base station; it needs no prior privileges or user interaction and compromises the modem execution context.
Summary
What happened
Out-of-bounds write in the MediaTek Chipset modem allows attackers controlling a rogue base station to escalate privileges remotely. The modem omits a bounds check before writing data and corrupts memory, but MediaTek has not disclosed the affected function, buffer, or message field. Exploitation requires a UE to connect to the rogue base station; it needs no prior privileges or user interaction and compromises the modem execution context.
The record
- CVE
- CVE-2026-20458
- Published
- Jul 1, 2026
- Updated
- Jul 1, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-787
- 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=MT2716
- Affected versionversion=MT2737
- Affected versionversion=MT6739
- Affected versionversion=MT6761
- Affected versionversion=MT6762
- Affected versionversion=MT6763
- Affected versionversion=MT6765
- Affected versionversion=MT6767
- Affected versionversion=MT6768
- Affected versionversion=MT6769
- Affected versionversion=MT6771
- Affected versionversion=MT6779
- Affected versionversion=MT6781
- Affected versionversion=MT6783
- Affected versionversion=MT6785
- Affected versionversion=MT6789
- Affected versionversion=MT6813
- Affected versionversion=MT6835
- Affected versionversion=MT6858
- Affected versionversion=MT6878
- Affected versionversion=MT6879
- Affected versionversion=MT6881
- Affected versionversion=MT6886
- Affected versionversion=MT6895
- Affected versionversion=MT6896
- Affected versionversion=MT6897
- Affected versionversion=MT6899
- Affected versionversion=MT6980
- Affected versionversion=MT6982
- Affected versionversion=MT6983
- Affected versionversion=MT6985
- Affected versionversion=MT6986
- Affected versionversion=MT6986D
- Affected versionversion=MT6988
- Affected versionversion=MT6989
- Affected versionversion=MT6990
- Affected versionversion=MT6991
- Affected versionversion=MT6993
- Affected versionversion=MT8666
- Affected versionversion=MT8667
- Affected versionversion=MT8668
- Affected versionversion=MT8673
- Affected versionversion=MT8676
- Affected versionversion=MT8678
- Affected versionversion=MT8755
- Affected versionversion=MT8765
- Affected versionversion=MT8766
- Affected versionversion=MT8766R
- Affected versionversion=MT8768
- Affected versionversion=MT8775
- Affected versionversion=MT8781
- Affected versionversion=MT8786
- Affected versionversion=MT8788
- Affected versionversion=MT8788E
- Affected versionversion=MT8789
- 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
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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