CVE-2026-21555: In modem, there is a possible improper input validation

High severity · published Aug 3, 2026

CVE-2026-21555

In modem, there is a possible improper input validation

7.5

CVSS

0.7%

EPSS

On KEV

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.7% · higher than 53% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

UDX710 · Unisoc (Shanghai) Technologies Co., Ltd.

Yocto · source: vendor

Affected product

UDX710

Unisoc (Shanghai) Technologies Co., Ltd.

All UDX710 CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-21555

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-21555

www.unisoc.com

https://www.unisoc.com/en/support/product-security-bulletin/2084109408382668801