Vulnerability in KDE Connect Protocol
CVE-2025-66270
The KDE Connect protocol 8 before 2025-11-28 does not correlate device IDs across two packets. This affects KDE Connect before 25.12 on desktop, KDE Connect before 0.5.4 on iOS, KDE Connect before 1.34.4 on Android, GSConnect before 68, and Valent before 1.0.0.alpha.49.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (8.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- KDE Connect Protocol — versions 8
Weakness classification (CWE)
References
- invent.kde.org/network/kdeconnect-kde/-/commit/4e53bcdd5d4c28bd9fefd114b807ce35…
- invent.kde.org/network/kdeconnect-android/-/commit/675d2d24a1eb95d15d9e5bde2b7e…
- invent.kde.org/network/kdeconnect-ios/-/commit/6c003c22d04270cabc4b262d399c753d…
- github.com/GSConnect/gnome-shell-extension-gsconnect/commit/a38246deec0af50ae21…
- github.com/andyholmes/valent/commit/85f773124a67ed1add79e7465bb088ec667cccce
- kde.org/info/security/advisory-20251128-1.txt
Frequently asked questions
- What is CVE-2025-66270?
- CVE-2025-66270 is a medium-severity vulnerability in KDE Connect Protocol, classified under Authentication Bypass by Spoofing. CVSS score: 4.7/10. Published 2025-12-05.
- How severe is CVE-2025-66270?
- Medium severity. CVSS v3 base score is 4.7 out of 10.