System crash via improperly validated modem input
Published Jul 1, 2026 · Updated Jul 1, 2026
Improper input validation in the modem of MediaTek Chipset devices allows physically proximate attackers to crash the system from a rogue base station. MediaTek has not disclosed the specific modem routine, message, or input field that is validated incorrectly. Exploitation requires a UE to connect to an attacker-controlled base station; it needs no privileges or user interaction and causes an availability-only crash.
Summary
What happened
Improper input validation in the modem of MediaTek Chipset devices allows physically proximate attackers to crash the system from a rogue base station. MediaTek has not disclosed the specific modem routine, message, or input field that is validated incorrectly. Exploitation requires a UE to connect to an attacker-controlled base station; it needs no privileges or user interaction and causes an availability-only crash.
The record
- CVE
- CVE-2026-20459
- Published
- Jul 1, 2026
- Updated
- Jul 1, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-288, T1499
- 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=MT2735
- 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=MT6833
- Affected versionversion=MT6835
- Affected versionversion=MT6853
- Affected versionversion=MT6855
- Affected versionversion=MT6858
- Affected versionversion=MT6873
- Affected versionversion=MT6875
- Affected versionversion=MT6877
- Affected versionversion=MT6878
- Affected versionversion=MT6879
- Affected versionversion=MT6880
- Affected versionversion=MT6881
- Affected versionversion=MT6883
- Affected versionversion=MT6885
- Affected versionversion=MT6886
- Affected versionversion=MT6889
- Affected versionversion=MT6890
- Affected versionversion=MT6891
- Affected versionversion=MT6893
- 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=MT8675
- Affected versionversion=MT8676
- Affected versionversion=MT8678
- Affected versionversion=MT8755
- Affected versionversion=MT8765
- Affected versionversion=MT8766
- Affected versionversion=MT8766R
- Affected versionversion=MT8768
- Affected versionversion=MT8771
- Affected versionversion=MT8775
- Affected versionversion=MT8781
- Affected versionversion=MT8786
- Affected versionversion=MT8788
- Affected versionversion=MT8788E
- Affected versionversion=MT8789
- Affected versionversion=MT8791
- Affected versionversion=MT8791T
- Affected versionversion=MT8792
- Affected versionversion=MT8793
- Affected versionversion=MT8795T
- Affected versionversion=MT8796
- Affected versionversion=MT8797
- 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
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
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Technologies
Your stack
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Your stack
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