{"id":"CVE-2025-7403","title":"Unsafe handling in bt_conn_tx_processor causes a use-after-free, resulting in a write-before-zero","summary":"Unsafe handling in bt_conn_tx_processor causes a use-after-free, resulting in a write-before-zero. The written 4 bytes are attacker-controlled, enabling precise memory corruption.","severity":"high","cvss":7.6,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","cwe":["CWE-123"],"vendor":"zephyrproject","product":"zephyr","affected":["zephyr <= 4.1.0"],"published":"2025-09-19","updated":"2026-10-13","sourceUpdated":"2026-10-13T20:17:01.040","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-7403","references":[{"url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-9r46-cqqw-6j2j","label":"vulnerabilities@zephyrproject.org"}],"tags":["nvd"],"epss":0.00208,"epssPercentile":0.10097,"ingestedAt":"2026-10-13T20:53:44.533Z","slug":"CVE-2025-7403","body":"## Overview\n\nUnsafe handling in bt_conn_tx_processor causes a use-after-free, resulting in a write-before-zero. The written 4 bytes are attacker-controlled, enabling precise memory corruption.\n\n## Affected\n\n- `zephyr <= 4.1.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}