Signature checking proves that an image is publisher-authorized, but it may still approve a previously signed release containing a known vulnerable component.

Dual-image recovery can protect availability after failed updates, but unrestricted rollback can also reinstall a vulnerable signed release on demand.

A size comparison is not a trusted authorization or freshness check, especially when the attacker can supply a previously valid image with a matching size.

A logo indicates product appearance and provides no cryptographic check of executable boot components.

Removing validation makes it easier for altered images to load and weakens the device's foundational trust boundary.

Attestation may reveal boot measurements to a verifier, but without enforcement a device may still execute tampered firmware.

Address reservation affects network configuration and cannot verify firmware executed before network services start.

A component inventory can identify installed libraries and dependencies, but it does not define the intended network conversations needed for access-policy automation.

An MIB defines objects used to query or manage device status; it is not a vendor declaration of allowed peer destinations and protocol flows.

SPDX can describe software provenance and packages, but specifying network-access intent for device models requires a different policy-description mechanism.

Ignoring interruption conditions increases outage probability in the device environment described.

Signature bypass removes an important safeguard against installing unauthorized code under privileged firmware control.

A failed write may leave no working firmware, turning a recoverable patch issue into device unavailability.

Wide disclosure of the debug credential defeats accountability and makes unauthorized console use easier.

DNS cache timing cannot prevent someone physically connected to a debug header from observing or altering device state.

Losing network telemetry does not close a physical debug avenue and reduces visibility into subsequent misuse.

Addresses can change or be spoofed and are not cryptographic proofs of the specific sensor holding an identity.

Topic membership alone cannot distinguish authorized publishers from impersonators or rogue devices.

Fleet-wide shared secrets create large blast radius and make individual accountability or selective revocation difficult.

Broad internal routing increases lateral movement potential and does not confine the thermostat's external destinations.

Low data rates do not make a device safe; quiet command-and-control or exfiltration can still occur.

Compromised devices can initiate sessions themselves, so inbound restrictions do not stop arbitrary outbound callbacks.

MAC entries can help locate devices, but lack firmware and product models required to correlate vendor advisories with affected sensors.

User counts do not reveal embedded device models, firmware versions, or security ownership across building systems.

Unverified assumptions conceal obsolete versions and prevent targeted remediation of known vulnerable units.

Procurement history may omit replacements, moves, or unapproved additions and cannot alone prove actual network inventory.

High-volume scanning can strain unsupported devices and may affect processes whose availability is safety-critical.

Fuzzing tests robustness but poses unacceptable disruption risk without an approved isolated test environment.

Mass restarts interrupt operations and do not represent a controlled identification technique for production OT.

Removing gateway identity controls weakens the chokepoint rather than securely mediating traffic from low-trust devices.

Wide privileged credentials magnify risk if any meter is compromised and bypass an appropriate separation boundary.

Flat trust allows compromised meters to probe unrelated billing components and reach database listeners directly.

Removing a cached name does not revoke the device identity or prevent a holder of the certificate from opening a direct connection to the broker.

Retention rules govern how long video is held, not whether an old device certificate remains a valid credential for the streaming service.

A factory reset may erase local settings, but leaving the original trusted identity active means a recovered credential could still authenticate to the broker.