PPTP, by design had known vulnerabilities. Especially when comes to Windows based systems. Most of the known vulnerabilities were addressed but some of those still exist which will lead to attacks like DoS or information compromization. When considering Windows based systems, even MSChap v2. Microsoft's Point to Point Encryption quite weak strength (a maximum of 128 bits).

VPN protocol Explained - PPTP vs L2TP vs SSTP vs IKEYv2 vs PPTP. PPTP short for Point-to-Point Tunneling Protocol was developed by Microsoft for creating … server - Is PPTP a secure VPN-protocol? - Ask Ubuntu 1) Is PPTP a secure VPN-protocol? - The short answer is no. PPTP has been the subject of many security analyses and serious security vulnerabilities have been found in the protocol. The known vulnerabilities relate to the underlying PPP authentication protocols used, the design of the MPPE protocol as well as the integration between MPPE and The strengths and weaknesses of different VPN Apr 26, 2019 Ultimate Guide to Free PPTP VPN For Beginners

What is PPTP? - Definition, Functions, Disadvantages, And More

configuration_guide_for_vpn - TP-Link

Best VPN Protocols: OpenVPN vs PPTP vs L2TP vs Others

Dec 27, 2018 Difference Between PPTP and L2TP | Difference Between