Quick answers
- Is CVE-2026-20563 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20563 being exploited in the wild.
- How severe is CVE-2026-20563?
- Informational severity, published 2 November 2026.
- Which products and versions are affected?
- MediaTek Modem.
- Is there a fix for CVE-2026-20563?
- 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-2026-20563 attacked?
- It is attacked over the network or from the adjacent network, in device firmware.
- Am I affected by CVE-2026-20563?
- Check whether you run MediaTek Modem. 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 incorrect bounds check in the modem's base station handling code permits an out-of-bounds write when processing network messages from a rogue base station. The vulnerability requires network-level proximity (the attacker must operate a cellular base station) but no authentication or privileges; exploitation causes a denial of service by crashing the modem. MediaTek has issued patches via Patch ID MOLY01777997.
Affected products
- MediaTek Modem
Timeline
- 2026-11-02: disclosed