{"id":"CVE-2026-78862","title":"An issue in Mercusys AC12 V2 allows a local attacker to execute arbitrary code via the UART serial interface on the printed circuit board (PCB)","summary":"An issue in Mercusys AC12 V2 allows a local attacker to execute arbitrary code via the UART serial interface on the printed circuit board (PCB)","severity":"medium","cvss":6.8,"cvssVector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-1299"],"published":"2026-10-05","updated":"2026-10-06","sourceUpdated":"2026-10-06T18:16:56.517","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78862","references":[{"url":"http://ac12.com","label":"cve@mitre.org"},{"url":"http://mercusys.com","label":"cve@mitre.org"},{"url":"https://threadpoolx.gitbook.io/docs/cve/mercusys-ac12-v2-security-advisory/unprotected-physical-debug-interface-uart","label":"cve@mitre.org"},{"url":"https://threadpoolx.gitbook.io/docs/cve/mercusys-ac12-v2-security-advisory/unprotected-physical-debug-interface-uart","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-10-06T16:54:36.278117Z"},"ingestedAt":"2026-10-05T20:32:56.655Z","epss":0.00261,"epssPercentile":0.1772,"slug":"CVE-2026-78862","body":"## Overview\n\nAn issue in Mercusys AC12 V2 allows a local attacker to execute arbitrary code via the UART serial interface on the printed circuit board (PCB)\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":37.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":216649,"id":"CVE-2026-78862","ts":1791310384458,"field":"exploit_available","old":"false","new":"true"},{"seq":216648,"id":"CVE-2026-78862","ts":1791310384458,"field":"cvss","old":null,"new":"6.8"},{"seq":216647,"id":"CVE-2026-78862","ts":1791310384458,"field":"severity","old":"none","new":"medium"}]}