CVE-2026-78862

Local Arbitrary Code Execution via Unprotected UART Interface on Mercusys AC12 V2

Published Oct 5, 2026 CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed
Description
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)

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mercusys
Mercusys ac12 V2
Vendors & Products Mercusys
Mercusys ac12 V2
Type Values Removed Values Added
Title Local Arbitrary Code Execution via Unprotected UART Interface on Mercusys AC12 V2
Type Values Removed Values Added
Title Local UART-Based Arbitrary Code Execution on Mercusys AC12 V2
Weaknesses CWE-20
CWE-94
Type Values Removed Values Added
Weaknesses CWE-1299
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Title Local UART-Based Arbitrary Code Execution on Mercusys AC12 V2
Weaknesses CWE-20
CWE-94
Type Values Removed Values Added
Description 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)
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Oct 6, 2026, 5:41 PM
Reserved
Aug 25, 2026, 12:00 AM
Status
Deferred
Published
Oct 5, 2026, 8:17 PM
Modified
Oct 6, 2026, 6:16 PM