System crash via modem NULL pointer dereference
Published Jul 1, 2026 · Updated Jul 1, 2026
NULL pointer dereference in the modem of affected MediaTek chipsets allows remote attackers to crash the system from a rogue base station. The modem fails to validate attacker-controlled cellular input before dereferencing a null pointer, terminating the system. Exploitation requires a UE to connect to the attacker-controlled base station; no privileges or user interaction are required, and the reported impact is a crash.
Summary
What happened
NULL pointer dereference in the modem of affected MediaTek chipsets allows remote attackers to crash the system from a rogue base station. The modem fails to validate attacker-controlled cellular input before dereferencing a null pointer, terminating the system. Exploitation requires a UE to connect to the attacker-controlled base station; no privileges or user interaction are required, and the reported impact is a crash.
The record
- CVE
- CVE-2026-20457
- Published
- Jul 1, 2026
- Updated
- Jul 1, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-476, 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
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- 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=MT6833
- Affected versionversion=MT6853
- Affected versionversion=MT6855
- Affected versionversion=MT6873
- Affected versionversion=MT6875
- Affected versionversion=MT6877
- Affected versionversion=MT6879
- Affected versionversion=MT6880
- 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=MT6980
- Affected versionversion=MT6983
- Affected versionversion=MT6985
- Affected versionversion=MT6989
- Affected versionversion=MT6990
- Affected versionversion=MT8666
- Affected versionversion=MT8667
- Affected versionversion=MT8673
- Affected versionversion=MT8675
- Affected versionversion=MT8765
- Affected versionversion=MT8766
- Affected versionversion=MT8766R
- Affected versionversion=MT8768
- Affected versionversion=MT8771
- Affected versionversion=MT8781
- Affected versionversion=MT8786
- Affected versionversion=MT8788
- Affected versionversion=MT8788E
- Affected versionversion=MT8789
- Affected versionversion=MT8791
- Affected versionversion=MT8791T
- Affected versionversion=MT8795T
- Affected versionversion=MT8796
- Affected versionversion=MT8797
- Affected versionversion=MT8798
- 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.
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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