CVE-2026-20461: MediaTek Modem out-of-bounds write via rogue base station

CVE-2026-20461 · Severity: info · Published 2026-07-01

A vulnerability exists in the modem component of several MediaTek chipsets used in mobile devices. If a device connects to a malicious base station controlled by an attacker, it could cause the modem to crash or stop functioning. This results in a denial of service, preventing the user from making calls or using cellular data.

Quick answers

Is CVE-2026-20461 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-20461 being exploited in the wild.
How severe is CVE-2026-20461?
Informational severity, published 1 July 2026.
Which products and versions are affected?
MediaTek MT2737; MediaTek MT6813; MediaTek MT6835; MediaTek MT6858; and 29 more.
Is there a fix for CVE-2026-20461?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-20461 attacked?
It is attacked from the adjacent network, in device firmware.
Am I affected by CVE-2026-20461?
Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds write vulnerability exists in MediaTek Modem firmware due to a missing bounds check. The flaw is triggered when a User Equipment (UE) connects to a rogue base station controlled by an attacker. Exploitation does not require additional execution privileges or user interaction. Successful exploitation leads to a remote denial of service (DoS) of the modem component. MediaTek has released patches under IDs MOLY01267281 and MOLY01318201 to address this issue.

Affected products

  • MediaTek MT2737
  • MediaTek MT6813
  • MediaTek MT6835
  • MediaTek MT6858
  • MediaTek MT6878
  • MediaTek MT6879
  • MediaTek MT6886
  • MediaTek MT6895
  • MediaTek MT6896
  • MediaTek MT6897
  • MediaTek MT6899
  • MediaTek MT6980
  • MediaTek MT6983
  • MediaTek MT6985
  • MediaTek MT6988
  • MediaTek MT6989
  • MediaTek MT6990
  • MediaTek MT6991
  • MediaTek MT6993
  • MediaTek MT8673
  • MediaTek MT8676
  • MediaTek MT8678
  • MediaTek MT8755
  • MediaTek MT8775
  • MediaTek MT8792
  • MediaTek MT8793
  • MediaTek MT8795T
  • MediaTek MT8796
  • MediaTek MT8798
  • MediaTek MT8863
  • MediaTek MT8873
  • MediaTek MT8883
  • MediaTek MT8893

Timeline

  • 2026-07-01: advisory: Published in MediaTek July 2026 Product Security Bulletin

References

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