The login barrier
The vendor acknowledged that brute-force attacks could bypass protections on the device’s web portal.
Vendor advisoryA school bathroom sensor. Two curious researchers. A privacy promise put to the test.
THE CENTRAL FINDING
A device sold for private spaces could become a listening device when its software was compromised. [2]
01 / THE STORY
Rey found an unfamiliar device on his high school’s network. Getting a secondhand unit to examine turned a question about a ceiling sensor into a public security investigation.
In his BSidesPDX retrospective, Rey describes moving from web security into hardware research and the Portland community that helped him along the way. [5]
FROM NETWORK DISCOVERY TO DEF CON
Reynaldo and nyx took the device apart, extracted its firmware, and examined the software behind its reassuring exterior. Their work became Unmasking the Snitch Puck, presented at DEF CON 33 in August 2025. [1] [8]
WIRED reported that attackers on the device’s network could guess weak administrator passwords and install custom firmware. Researchers demonstrated live listening through a secondhand HALO 3C’s microphones. [2]
Read the finding carefully. A demonstrated capability is not proof that deployed devices were secretly recording people. The vendor’s advisory said it knew of no exploitation in customer environments. [3]
02 / INSIDE THE PROMISE
HALO is marketed for vape detection, air quality, and safety alerts in places where cameras would be intrusive.
Its advertised audio analytics include selected spoken keywords, critical noises, and gunshot detection. [4] Motorola’s 2024 solution brief describes HALO as not using visual or audio recording
. [9] These are vendor claims, not an independent test of detection accuracy.
THE PRIVACY BOUNDARY LIVES IN THE SOFTWARE.
A promise about what a sensor normally does depends on who can change what it does. Security is part of the privacy promise.
03 / WHAT FAILED
The vendor acknowledged that brute-force attacks could bypass protections on the device’s web portal.
Vendor advisoryThe same advisory acknowledged the ability to install unauthorized or malicious firmware.
Vendor advisoryControlling the software let the researchers repurpose a sensor as an audio bug.
WIRED reportingThis is a summary of the published research. It does not assess the configuration or firmware of any particular installation today.
04 / THE PUBLIC RECORD
Follow the product’s expansion, the disclosure, and the response.
2023 → 2025A vendor case study describes 12 HALO devices installed in Saratoga Springs public-housing apartments earlier that year to enforce a nonsmoking policy. [6]
Motorola Solutions announces its acquisition of the company behind HALO. [7]
The vendor publishes affected firmware versions and identifies version 2.17.0.2 as addressing the vulnerabilities. [3]
DEF CON publishes the conference recording on its YouTube channel. [1]
05 / THE VENDOR RESPONSE
The August 2025 advisory identifies a firmware remedy. It does not establish the update status of every device.
Cloud-connected units were to update automatically, except where customers opted out. Standalone units require manual installation. [3]
| Device | Affected firmware |
|---|---|
| HALO 3C | 2.15.0.13 and earlier |
| HALO 2 / 2C | 2.14.3.0 and earlier |
Named fix: 2.17.0.2. For a current installation, check the vendor’s latest firmware and verify that it is installed. [3]
Read the archived advisory06 / THE BIGGER QUESTION
The patch addresses reported vulnerabilities. The research also invites a conversation about consent, oversight, and the limits of safety technology.
What problem is this sensor meant to solve, and what evidence shows it helps?
Who can access the device, change its firmware, or see the information it produces?
Who checks updates, reviews mistakes, and hears concerns from the people being monitored?
These are editorial questions for a school board, housing authority, or administrator, rather than findings about any specific deployment.
START WITH THE PRIMARY SOURCE
Unmasking the Snitch Puck: IoT surveillance tech in the school bathroom
Reynaldo & nyx · DEF CON 33
The video opens on YouTube. No third-party player loads on this page.
07 / GO TO THE SOURCE
Reporting, researcher accounts, and the vendor’s own documents. Each plays a different role in this story.
Sources checked October 14, 2026. Product pages may change. The advisory dates and firmware versions above refer to the 2025 disclosure.