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Vulnerability · Published Dec 5, 2025 · Assigned by mitre

CVE-2025-66270

Medium 4.7

In plain English

A medium-severity authentication bypass by spoofing in KDE Connect protocol from KDE. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.2%top 88.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13gnome-shell-extension-gsconnect62-1+deb13u1DSA-6066-1
Debian:13gnome-shell-extension-gsconnect62-1+deb13u1DEBIAN-CVE-2025-66270
Debian:14gnome-shell-extension-gsconnect71-1DEBIAN-CVE-2025-66270
Debian:13kdeconnect25.04.2-1+deb13u1DEBIAN-CVE-2025-66270
Debian:13kdeconnect25.04.2-1+deb13u1DSA-6063-1
Debian:14kdeconnect25.11.80+git20251121.7090b106-1DEBIAN-CVE-2025-66270
Ubuntu:25.10gnome-shell-extension-gsconnectno fix listedUBUNTU-CVE-2025-66270
Ubuntu:25.10kdeconnect25.08.1-0ubuntu2.1UBUNTU-CVE-2025-66270
Ubuntu:25.10kdeconnect25.08.1-0ubuntu2.1USN-7905-1

Affected products (as reported)

VendorProductVersions
KDE KDE Connect protocol 8

Weakness: CWE-290 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

References