Vulnerability in Yftech Coros Pace 3
CVE-2025-32878
An issue was discovered on COROS PACE 3 devices through 3.0808.0. It implements a function to connect the watch to a WLAN. This function is mainly for downloading firmware files. Before downloading firmware files, the watch requests some information about the firmware via HTTPS from the back-end API. However, the X.509 server certificate within the TLS handshake is not validated by the device. This allows an attacker within an active machine-in-the-middle position, using a TLS proxy and a self-signed certificate, to eavesdrop and manipulate the HTTPS communication. This could be abused, for example, for stealing the API access token of the assigned user account.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- syss.de (Third Party Advisory)
- support.coros.com/hc/en-us/articles/20087694119828-COROS-PACE-3-Release-Notes (Release Notes)
- www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-030.txt (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-32878?
- CVE-2025-32878 is a critical-severity vulnerability in Yftech Coros Pace 3, classified under Improper Certificate Validation. CVSS score: 9.8/10. Published 2025-06-20.
- How severe is CVE-2025-32878?
- Critical severity. CVSS v3 base score is 9.8 out of 10.