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CVE-2026-121818 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Herowatch Mini developed by About Time Technologies has a system signing vulnerability. Authenticated local attackers can exploit a publicly available test key to sign malicious programs, allowing them to elevate privileges and execute arbitrary code.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://www.twcert.org.tw/en/cp-139-11362-1e829-2.html	[email protected]	AdvisoryRemedy
https://www.twcert.org.tw/tw/cp-132-11360-ab123-1.html	[email protected]	AdvisoryRemedy

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1394	Use of Default Cryptographic Key	[email protected]

Affected Products

Product	Versions
About Time Technologies Herowatch Mini	All versions
CPE No CPEs found in CPE dictionary for this product. Remediation Workaround:high effort Replace the Herowatch Mini with a supported device.
About Time Technologies Herowatch Go	All versions
CPE No CPEs found in CPE dictionary for this product. Remediation No remediation found in references.

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Modified	CISA-ADP
Nov 4, 2026	New CVE Received	[email protected]