# CVE-2026-79405: Unisoc modem firmware input validation DoS

Source: https://junglewise.ai/threats/cve-2026-79405-in-modem-firmware-there-is-a-possible-system-crash-due-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-04. Updated: 2026-11-04  
License: CC BY 4.0 with a link back

CVE-2026-79405 · Severity: high · CVSS 7.5 · Published 2026-11-04

Unisoc modem firmware contains a flaw that fails to properly validate dedicated PUCCH (Physical Uplink Control Channel) configuration data, allowing remote attackers to crash the modem without any special privileges. This could lead to a denial of service affecting devices that rely on the modem for cellular connectivity, such as smartphones and IoT devices.

Vendors: [Unisoc](https://junglewise.ai/threats/vendors/unisoc).

## Quick answers

**Is CVE-2026-79405 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-79405 being exploited in the wild.

**How severe is CVE-2026-79405?** High severity, with a CVSS score of 7.5, published 4 November 2026.

**Which products and versions are affected?** Unisoc UDX710 modem firmware.

**Is there a fix for CVE-2026-79405?** 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-2026-79405 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-79405?** Check whether you run Unisoc UDX710 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

An improper input validation flaw (CWE-20) in modem firmware allows remote denial of service via malformed PUCCH configuration messages sent over the network. No authentication or user interaction is required to trigger the crash. The vulnerability affects Unisoc UDX710 chipset.

## Affected products

- Unisoc UDX710 modem firmware

## Timeline

- 2026-11-04: disclosed

## References

- [https://www.unisoc.com/en/support/product-security-bulletin/2117823464494759937](https://www.unisoc.com/en/support/product-security-bulletin/2117823464494759937)