{"id":"CVE-2026-66086","published":"2026-10-12T02:16:57.600","lastModified":"2026-10-16T19:55:59.740","description":"In the modem OTA stack, there is a possible stack-based buffer overflow due to improper validation of scheduling information in SIB1 messages. This could lead to remote code execution or denial of service with no additional execution privileges needed.","cvssScore":9.8,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-121"],"vendors":[],"products":[],"references":[{"url":"https://www.unisoc.com/en/support/product-security-bulletin/2109454821805424641","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A stack-based buffer overflow exists in the modem's OTA update system due to inadequate validation of SIB1 scheduling information, potentially allowing remote code execution or denial of service without any privileges.","exploitability":"Exploitation is likely straightforward with no prerequisites needed, as the vulnerability occurs during OTA updates and requires only network access to trigger the malformed SIB1 message.","blast_radius":"The impact could be widespread across all affected modems that process OTA updates, potentially affecting thousands of devices in the field that rely on cellular connectivity.","remediation":"No fixed version is published in the description, so disable the modem's OTA update functionality until a patch is available.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","modem","ota","ics"],"model":"garnet-coder","analyzedAt":"2026-10-12T08:51:06.809Z"}}