A improper control of a resource through its lifetime in Fortinet FortiClientWindows version 6.4.1 and 6.4.0, version 6.2.9 and below, version 6.0.10 and below allows attacker to cause a complete denial of service of its components via changes of directory access permissions.

Use of a hard-coded cryptographic key to encrypt security sensitive data in local storage and configuration in FortiClient for Windows prior to 6.4.0 may allow an attacker with access to the local storage or the configuration backup file to decrypt the sensitive data via knowledge of the hard-coded key.

An Insecure Temporary File vulnerability in FortiClient for Windows 6.2.1 and below may allow a local user to gain elevated privileges via exhausting the pool of temporary file names combined with a symbolic link attack.

An Unsafe Search Path vulnerability in FortiClient for Windows online installer 6.2.3 and below may allow a local attacker with control over the directory in which FortiClientOnlineInstaller.exe and FortiClientVPNOnlineInstaller.exe resides to execute arbitrary code on the system via uploading malicious Filter Library DLL files in that directory.

Use of a hardcoded cryptographic key in the FortiGuard services communication protocol may allow a Man in the middle with knowledge of the key to eavesdrop on and modify information (URL/SPAM services in FortiOS 5.6, and URL/SPAM/AV services in FortiOS 6.0.; URL rating in FortiClient) sent and received from Fortiguard severs by decrypting these messages. Affected products include FortiClient for Windows 6.0.6 and below, FortiOS 6.0.7 and below, FortiClient for Mac OS 6.2.1 and below.

A malicious DLL preload vulnerability in Fortinet FortiClient for Windows 6.2.0 and below allows a privileged attacker to perform arbitrary code execution via forging that DLL.

A local privilege escalation in Fortinet FortiClient for Windows 6.0.4 and earlier allows attacker to execute unauthorized code or commands via the parsing of the file.

A local privilege escalation in Fortinet FortiClient for Windows 6.0.4 and earlier allows attackers to execute unauthorized code or commands via the named pipe responsible for Forticlient updates.

A local privilege escalation in Fortinet FortiClient for Windows 6.0.4 and earlier allows attacker to execute unauthorized code or commands via the command injection.

An Unsafe Search Path vulnerability in FortiClient Online Installer (Windows version before 6.0.6) may allow an unauthenticated, remote attacker with control over the directory in which FortiClientOnlineInstaller.exe resides to execute arbitrary code on the system via uploading malicious .dll files in that directory.

A null pointer dereference vulnerability in Fortinet FortiClientWindows 6.0.2 and earlier allows attacker to cause a denial of service via the NDIS miniport driver.

Users' VPN authentication credentials are unsafely encrypted in Fortinet FortiClient for Windows 5.6.0 and below versions, FortiClient for Mac OSX 5.6.0 and below versions and FortiClient SSLVPN Client for Linux 4.4.2335 and below versions, due to the use of a static encryption key and weak encryption algorithms.

An Information Disclosure vulnerability in Fortinet FortiClient for Windows 5.6.0 and below versions, FortiClient for Mac OSX 5.6.0 and below versions and FortiClient SSLVPN Client for Linux 4.4.2334 and below versions allows regular users to see each other's VPN authentication credentials due to improperly secured storage locations.

A privilege escalation in Fortinet FortiClient Windows 5.4.3 and earlier as well as 5.6.0 allows attacker to gain privilege via exploiting the Windows "security alert" dialog thereby popping up when the "VPN before logon" feature is enabled and an untrusted certificate chain.