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A vulnerability in Bluetooth-enabled KARR aftermarket car alarms could let someone nearby unlock a vehicle, silence its alarm, flash its lights, honk its horn or disable its ignition. It does not, by itself, let an attacker start or remotely steer the car. The issue affects the add-on alarm system—not every car from a particular manufacturer—and owners should check for the system and install the vendor’s firmware update if it is present.
What the KARR vulnerability lets an attacker do
UC San Diego researchers found a weakness in Bluetooth-enabled KARR alarm systems, also identified in reporting as KARR/SWDS. According to WIRED’s July 21, 2026 report and KPBS’s July 30, 2026 report, a shared Bluetooth authentication key in the KARR smartphone app allowed the researchers to build an app that sent commands accepted by nearby vulnerable devices.
Those commands could unlock the car, disable the alarm, honk the horn, flash the lights or disable the ignition. Disabling ignition could strand a driver, but the Bluetooth flaw does not itself start the engine or give an attacker remote steering control. The demonstrated attack requires the attacker to be within Bluetooth range.
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WIRED also describes a separate car-theft technique involving physical entry and a locksmith tool. That is distinct from the Bluetooth vulnerability: it should not be taken to mean the flaw itself starts the car.
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Which vehicles may have the affected system?
The issue is in an aftermarket alarm installed by dealers, sometimes to protect cars on dealer lots. Reporting says a KARR unit could remain in a vehicle after sale even if the buyer had not requested or activated the add-on. A car’s make or model alone does not establish whether it has the system.
Researchers estimate that more than 2 million Bluetooth-enabled KARR devices have been deployed, according to WIRED. That is an estimate based on crowdsourced WiGLE signal data and serial-number extrapolation, not a verified count of vehicles that remain vulnerable today. KPBS separately reported UCSD researcher Nishant Bhaskar’s estimate that more than 2.2 million cars had been sold in Southern California since 2017. That regional sales estimate is not an audited count of currently vulnerable cars. Researchers also found devices in the United States and other countries, so the issue is not limited to Southern California.
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WIRED reported that researchers found 97 KARR-equipped vehicles during a 20-minute scan near UCSD. This is a local field observation, not a measure of how common the system is across the broader vehicle population. Neither report establishes how many devices remain unpatched.
How to check whether your car has a KARR alarm
Look for a KARR or SWDS sticker on a vehicle window. WIRED also reports that the system may have a small button with a blinking light attached beneath the dashboard. These are clues to identification, not proof that a particular unit is still vulnerable or that it has received an update.
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If you cannot tell whether a device is installed, contact the vehicle dealer or KARR customer support for guidance. Do not assume that the system is absent simply because you do not remember buying or activating it; dealer-installed equipment may have been fitted before the sale.
How to update the KARR system
KPBS reported that Acrisure Protection Group released a firmware patch on July 20, 2026. WIRED reported that owners with the KARR app may receive an alert. For owners without it, WIRED described this update path:
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- Download the KARR Security app from the appropriate app store.
- Use the app to connect to the KARR alarm in your vehicle.
- In the app, select Customer Service, then Firmware Update.
- Follow the app’s prompts and check that the update completes.
App instructions can change, so follow the current directions from Acrisure Protection Group if the labels or steps differ. If the app cannot connect or the update fails, contact the company or a dealer for help rather than treating a failed attempt as confirmation that the device is patched.
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What the company says about the risk
Acrisure Protection Group characterized the vulnerability as “highly complex” and “low risk to customers under real-world conditions,” while saying it developed a firmware update. That is the company’s assessment, not an independent risk determination.
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WIRED reported that researchers privately notified the company in January 2025 and that the patch arrived close to 18 months later, shortly before planned conference presentations. The company said it planned communications through its app, website and dealers; WIRED reported that it had not explained how it would reach owners who did not know a KARR device was installed.
Quick Recap
What to do if you find one
- Use the KARR Security app to check for and install the firmware update.
- If you cannot identify the unit or complete the update, contact Acrisure Protection Group or the dealer for assistance.
- Do not treat buying a different alarm, an OBD-II scanner or other generic anti-theft equipment as a fix for this shared-key vulnerability; the reported remedy is a firmware update for the KARR device.
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