This vulnerability (CVE-2025-71254) affects multiple Unisoc (Shanghai) Technologies chipsets including SC7731E, SC9832E, SC9863A, and others running Android 13 to 16. It is caused by improper input validation in the modem IMS subsystem, which can be triggered remotely to cause a denial of service condition. The CVSS 3.1 base score is 7.5, reflecting high impact on availability with no required privileges or user interaction. The vendor has not published any patch or remediation details, and the vulnerability is currently unpatched.

Successful exploitation results in a remote denial of service affecting the availability of the modem IMS component. There is no impact on confidentiality or integrity. No additional execution privileges are required for exploitation. No known exploits have been observed in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, affected users should monitor vendor communications for updates. No specific mitigations or workarounds have been provided by the vendor.