CVE-2026-121818

About Time Technologies|Herowatch Go - Security Misconfiguration

Published Nov 4, 2026 CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

The product is no longer maintained. Users are advised to replace it with a supported device.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared About Time Technologies
About Time Technologies herowatch Go
Vendors & Products About Time Technologies
About Time Technologies herowatch Go
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title About Time Technologies|Herowatch Go - Security Misconfiguration
Weaknesses CWE-1394
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.5, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
twcert
Published
Updated
Nov 4, 2026, 8:00 PM
Reserved
Nov 4, 2026, 5:40 AM
Status
Deferred
Published
Nov 4, 2026, 7:17 AM
Modified
Nov 4, 2026, 8:19 PM