# CVE-2026-20594: MediaTek Modem out-of-bounds read with missing bounds check

Source: https://junglewise.ai/threats/cve-2026-20594-in-modem-there-is-a-possible-out-of-bounds-read-due-to-a-missing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-02. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-20594 · Severity: info · Published 2026-11-02

A vulnerability in MediaTek modem firmware allows an attacker to trigger a remote denial of service attack by impersonating a legitimate base station. An attacker controlling a rogue cellular base station can cause connected devices to crash or become unresponsive without any special privileges or user interaction required.

Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## Quick answers

**Is CVE-2026-20594 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20594 being exploited in the wild.

**How severe is CVE-2026-20594?** Informational severity, published 2 November 2026.

**Which products and versions are affected?** MediaTek Modem firmware.

**Is there a fix for CVE-2026-20594?** 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-2026-20594 attacked?** It is attacked over the network or from the adjacent network, in device firmware.

**Am I affected by CVE-2026-20594?** Check whether you run MediaTek Modem firmware. 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

The modem firmware contains an out-of-bounds read vulnerability due to missing bounds checking, triggered via malformed cellular network signaling. An attacker controlling a rogue base station can send specially crafted network messages that cause the modem to read beyond allocated buffer boundaries, resulting in denial of service. The vulnerability requires network adjacency (the device must connect to the attacker's fake base station) but no additional execution privileges or user interaction.

## Affected products

- MediaTek Modem firmware

## Timeline

- 2026-11-02: disclosed

## References

- [https://www.mediatek.com/product-security-bulletin/November-2026](https://www.mediatek.com/product-security-bulletin/November-2026)

## Related threats

- [MediaTek Modem out of bounds write due to missing bounds check](https://junglewise.ai/threats/cve-2026-20557-in-modem-there-is-a-possible-out-of-bounds-write-due-to-a-missing)