Quick answers
- Is CVE-2026-20520 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20520 being exploited in the wild.
- How severe is CVE-2026-20520?
- High severity, with a CVSS score of 7.5, published 5 October 2026.
- Which products and versions are affected?
- MediaTek MT2716; MediaTek MT2735; MediaTek MT2737; MediaTek MT6813; and 22 more.
- Is there a fix for CVE-2026-20520?
- 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-2026-20520 attacked?
- It is attacked over the network, in device firmware.
- Am I affected by CVE-2026-20520?
- Check whether you run MediaTek Mt2716, MediaTek MT2735, MediaTek MT2737 or one of the others listed. 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
A missing bounds check in the modem component allows an out-of-bounds write (CWE-787) when processing certain cellular protocol messages. An attacker can exploit this via a malicious base station a device connects to, without needing to bypass any authentication or user interaction. Successful exploitation grants remote privilege escalation on the affected device.
Affected products
- MediaTek MT2716
- MediaTek MT2735
- MediaTek MT2737
- MediaTek MT6813
- MediaTek MT6815
- MediaTek MT6833
- MediaTek MT6835
- MediaTek MT6853
- MediaTek MT6855
- MediaTek MT6858
- MediaTek MT6873
- MediaTek MT6875
- MediaTek MT6877
- MediaTek MT6878
- MediaTek MT6879
- MediaTek MT6880
- MediaTek MT6881
- MediaTek MT6883
- MediaTek MT6885
- MediaTek MT6886
- MediaTek MT6889
- MediaTek MT6890
- MediaTek MT6891
- MediaTek MT6893
- MediaTek MT6895
- MediaTek MT6896
Timeline
- 2026-10-05: disclosed