CVE-2026-66086

Stack-based Buffer Overflow in Modem

Published Oct 12, 2026 CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
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.

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': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Unisoc
Unisoc modem
Vendors & Products Unisoc
Unisoc modem
Type Values Removed Values Added
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.
Title Stack-based Buffer Overflow in Modem
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 8.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Unisoc
Published
Updated
Oct 15, 2026, 6:08 PM
Reserved
Jul 24, 2026, 2:05 AM
Status
Awaiting Analysis
Published
Oct 12, 2026, 2:16 AM
Modified
Oct 16, 2026, 7:55 PM