Quick answers
- Is CVE-2026-20479 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20479 being exploited in the wild.
- How severe is CVE-2026-20479?
- High severity, with a CVSS score of 7.5, published 3 August 2026.
- Which products and versions are affected?
- MediaTek Modem.
- Is there a fix for CVE-2026-20479?
- 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-2026-20479 attacked?
- It is attacked over the network, in device firmware.
- Am I affected by CVE-2026-20479?
- Check whether you run MediaTek Modem, MediaTek MT2735, MediaTek Mt2735 Firmware 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
This vulnerability is an out-of-bounds read in MediaTek's modem firmware caused by a missing bounds check. The flaw exists in modem processing logic that handles cellular base station communications. An attacker can exploit this by operating a rogue 5G or 4G base station and transmitting a specially crafted message to a victim device connected to the malicious station. The out-of-bounds read can cause a crash or undefined behavior in the modem, leading to denial of service. MediaTek has released patches via security bulletin (Patch ID: MOLY00741071) with fixes available to OEMs.
Affected products
- MediaTek Modem
Timeline
- 2026-08-03: disclosed
- 2026-08-03: advisory: MediaTek Product Security Bulletin published