CVE-2025-32876: coros pace 3 Missing Auth — Exploit

Description

An issue was discovered on COROS PACE 3 devices through 3.0808.0. The BLE implementation of the COROS smartwatch does not support LE Secure Connections and instead enforces BLE Legacy Pairing. In BLE Legacy Pairing, the Short-Term Key (STK) can be easily guessed. This requires knowledge of the Temporary Key (TK), which, in the case of the COROS Pace 3, is set to 0 due to the Just Works pairing method. An attacker within Bluetooth range can therefore perform sniffing attacks, allowing eavesdropping on the communication.

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CVSS v3.1 Score

6.8

MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-306 Missing Authentication

Affected Products

Vendor	Product	Versions
yftech	coros_pace_3_firmware	< 3.0808.0
yftech	coros_pace_3	All

References

Exploits

https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-023.txt https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-023.txt

Other References

https://support.coros.com/hc/en-us/articles/20087694119828-COROS-PACE-3-Release-Notes https://syss.de

Frequently Asked Questions

What is CVE-2025-32876? +

An issue was discovered on COROS PACE 3 devices through 3.0808.0. The BLE implementation of the COROS smartwatch does not support LE Secure Connections and instead enforces BLE Legacy Pairing. In BLE Legacy Pairing, the Short-Term Key (STK) can be easily guessed. This requires knowledge of the Temporary Key (TK), which, in the case of the COROS Pace 3, is set to 0 due to the Just Works pairing method. An attacker within Bluetooth range can therefore perform sniffing attacks, allowing eavesdropping on the communication. It has a CVSS v3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2025-32876? +

CVE-2025-32876 has a CVSS v3.1 score of 6.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-32876? +

CVE-2025-32876 affects products from yftech, specifically: coros_pace_3, coros_pace_3_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-32876? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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