# CVE-2026-79405: Improper Input Validation in Modem Firmware

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

In Modem Firmware, there is a possible system crash due to improper input validation of dedicated PUCCH configuration. This could lead to remote denial of service with no additional execution privileges needed.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Unisoc (Shanghai) Technologies Co., Ltd. / Modem: UDX710 (affected). Source: CNA: Unisoc

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: Unisoc

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: security@unisoc.com

- CISA KEV: No listing in collected sources

- EPSS: 0.71% as of 2026-11-04; percentile 53.51%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-20

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

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

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

## Provenance

- CNA: Unisoc: https://www.cve.org/CVERecord?id=CVE-2026-79405; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-79405; retrieved 2026-11-04; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-79405; retrieved 2026-11-04; source updated Not reported

Revision: 0a7b71e66dc32895b677d426b9e7ddce715cd1b78e21f5cba6aaa19abc8a7f7d

Canonical: https://y2.dev/cve/CVE-2026-79405

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