System crash via modem heap buffer overflow
Published May 4, 2026 · Updated May 4, 2026
Heap buffer overflow in the modem of affected MediaTek chipsets allows physically proximate attackers to crash the system via a rogue base station. MediaTek has not published the affected modem routine, the input field involved, or the unchecked heap-buffer operation. Exploitation requires the user equipment to connect to an attacker-controlled base station, needs no privileges or user interaction, and interrupts availability by crashing the device.
Summary
What happened
Heap buffer overflow in the modem of affected MediaTek chipsets allows physically proximate attackers to crash the system via a rogue base station. MediaTek has not published the affected modem routine, the input field involved, or the unchecked heap-buffer operation. Exploitation requires the user equipment to connect to an attacker-controlled base station, needs no privileges or user interaction, and interrupts availability by crashing the device.
The record
- CVE
- CVE-2026-20449
- Published
- May 4, 2026
- Updated
- May 4, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-120, T1642
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 4, 2026CVE publishedPublication date reported by the CVE source.
- May 4, 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=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=MT6815
- 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=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=MT6983
- Affected versionversion=MT6985
- Affected versionversion=MT6986D
- Affected versionversion=MT6988
- Affected versionversion=MT6989
- Affected versionversion=MT6990
- Affected versionversion=MT6991
- Affected versionversion=MT6993
- Affected versionversion=MT8668
- Affected versionversion=MT8673
- Affected versionversion=MT8675
- Affected versionversion=MT8676
- Affected versionversion=MT8678
- Affected versionversion=MT8755
- Affected versionversion=MT8771
- Affected versionversion=MT8775
- Affected versionversion=MT8791
- Affected versionversion=MT8791T
- Affected versionversion=MT8792
- Affected versionversion=MT8793
- Affected versionversion=MT8795T
- 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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