---
id: CVE-2026-21551
title: 'In modem, there is a possible improper input validation'
summary: >-
  In modem, there is a possible improper input validation. This could lead to
  remote denial of service with no additional execution privileges needed
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-20
published: '2026-08-03'
updated: '2026-08-28'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21551'
references:
  - url: >-
      https://www.unisoc.com/en/support/product-security-bulletin/2084109408382668801
    label: security@unisoc.com
tags:
  - nvd
epss: 0.00706
epssPercentile: 0.51387
ingestedAt: '2026-08-29T16:39:13.111Z'
---

## Overview

In modem, there is a possible improper input validation. This could lead to remote denial of service with no additional execution privileges needed

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.