KDM in KDE 3.1.3 and earlier does not verify whether the pamsetcred function call succeeds, which may allow attackers to gain root privileges by triggering error conditions within PAM modules, as demonstrated in certain configurations of the MIT pamkrb5 module.

KDM in KDE 3.1.3 and earlier uses a weak session cookie generation algorithm that does not provide 128 bits of entropy, which allows attackers to guess session cookies via brute force methods and gain access to the user session.

The KApplication class in the KDE 1.1.2 configuration file management capability allows local users to overwrite arbitrary files.

Buffer overflow in KDE kdesud on Linux allows local uses to gain privileges via a long DISPLAY environmental variable.

rendering/renderreplaced.cpp in Konqueror in KDE before 4.9.3 allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted web page, related to "trying to reuse a frame with a null part."

The KDE screen saver in KDE before 3.0.5 does not properly check the return value from a certain function call, which allows attackers with physical access to cause a crash and access the desktop session.