CVE Alert: CVE-2026-121816 – About Time Technologies

Herowatch Mini developed by Time Technologies has a Missing Authentication vulnerability. Unauthenticated remote attackers can connect to the affected device’s ADB service and obtain an ADB shell, thereby accessing device resources or performing related operations.

**Risk verdict:** High practical risk for any reachable device; prioritise containment and replacement, while exploitation status remains unconfirmed.

**Why this matters:** An unauthenticated debugging interface can give an attacker broad control of the device, enabling access to stored data, alteration of settings or software, and disruption of service. For a wearable or safety device, compromise may expose sensitive user information or undermine its reliability when users depend on it.

**Most likely attack path:** An attacker must be on the same or an adjacent network, but needs no account, user action or complex setup. The assessed impact is confined to the device’s security boundary; use of the device as a stepping stone is possible but not established. KEV, SSVC exploitation state, PoC and EPSS data were not supplied, so active exploitation and prevalence cannot be assessed.

**Who is most exposed:** Organisations or households using these devices on shared, guest or otherwise poorly isolated Wi-Fi are most exposed. Fleet-managed or safety-critical deployments warrant particular attention.

Look for unexpected connections to the device’s ADB service from local-network hosts.

Review device and network logs for shell sessions or debugging commands.

Check for unexplained configuration changes, new apps or unusual outbound traffic.

Mitigation and prioritisation:

Replace with a supported device; no maintained product fix is indicated.

Until replacement, isolate devices on a restricted network and block inbound access to ADB.

Inventory deployed units and prioritise those on shared networks or used for safety functions.

Plan replacement through change management, validating user migration and service continuity.

A considerable amount of time and effort goes into maintaining this website, creating backend automation and creating new features and content for you to make actionable intelligence decisions. Everyone that supports the site helps enable new functionality.

If you like the site, please support us on Patreon or Buy Me A Coffee using the buttons below.