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CVE-2025-32878

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-06-20 · updated 2026-06-17
• Weakness: CWE-295

Description

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.

Affected products

• Yftech Coros Pace 3 Firmware: through 3.0808.0

References

• https://support.coros.com/hc/en-us/articles/20087694119828-COROS-PACE-3-Release-Notes
• https://syss.de
• https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2025-030.txt

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