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Some VPN providers offer a free version app with limited features to advertise themselves.

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GFW, is constantly evolving. What works today might not work tomorrow. Most providers are constantly engaged in a battle to stay ahead of GFW blocking techniques. However, not every provider can give a 100% guarantee to bypass GFW.

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WireGuard offers advantages like speed and security, its lack of built-in obfuscation and potential for server detection can make it less reliable for bypassing the GFW. If bypassing the GFW is your primary concern, other VPN protocols might be more suitable.

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GFW, is constantly evolving. What works today might not work tomorrow. Most providers are constantly engaged in a battle to stay ahead of GFW blocking techniques. However, not every provider can give a 100% guarantee to bypass GFW.

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Shadowsocks is not an emerging protocol. It is actually considered a mature protocol that was developed in 2012-2017 and was no longer upgraded.

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Shadowsocks, although initially effective at bypassing censorship, has inherent vulnerabilities that can be custom exploited, for example using its own encryption methods (RC4 or AES-GCM) in encryption unlike the OpenVPN protocol. These have not been thoroughly tested by security experts, raising concerns about potential weaknesses that attackers could exploit. Also, Shadowsocks lacks features like Perfect Forward Secrecy (PFS). Without PFS, even if the server's private key is compromised, past encrypted sessions can still be decrypted if an attacker later gains access to the key. This can expose sensitive information. These limitations make Shadowsocks less secure than some alternatives, especially as GFW detection methods are evolving.

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CVE-2016-5360 (July 2016): A vulnerability was discovered in OpenConnect versions before 7.06, where the SSL certificate verification was not correctly performed. This flaw could allow a man-in-the-middle attacker to spoof SSL servers via an arbitrary valid certificate.

CVE-2018-8048 (May 2018): A security issue was found in OpenConnect versions before 8.02, where the application did not properly validate SSL certificates. An attacker could exploit this vulnerability to conduct man-in-the-middle attacks.

CVE-2019-16239 (September 2019): A vulnerability was identified in OpenConnect versions before 8.02, where the application failed to properly validate SSL certificates. An attacker could exploit this flaw to perform man-in-the-middle attacks against SSL/TLS connections established by the affected software.

CVE-2020-12823 (June 2020): A vulnerability was discovered in OpenConnect before 8.09 due to a lack of verification of the server's certificate. An attacker could exploit this vulnerability to conduct man-in-the-middle attacks by presenting a crafted certificate to the client.

CVE-2021-26255 (February 2021): A vulnerability was found in OpenConnect before 8.10. This flaw could allow a remote attacker to conduct man-in-the-middle attacks by presenting a crafted certificate during an SSL handshake.

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Heartbleed (2014) This vulnerability affected OpenSSL, a cryptography library commonly used by OpenVPN. It allowed attackers to potentially steal data from servers. However, most VPN providers addressed this by patching OpenSSL or using alternative libraries.

CVE-2016-2460 (2016) This vulnerability could allow attackers to potentially crash a VPN server under specific circumstances. It was patched in later OpenVPN versions.

Authentication Bypass Vulnerability In October 2018, an authentication bypass vulnerability (CVE-2018-17456) was discovered in OpenVPN Connect for Android. This vulnerability could allow an attacker to establish a VPN connection without proper authentication, potentially compromising the security of the VPN tunnel.

Denial-of-Service Vulnerability In October 2020, a denial-of-service vulnerability (CVE-2020-15078) was discovered in OpenVPN 2.4.9 and earlier versions. This vulnerability could allow a remote attacker to cause a server crash or consume excessive resources by sending a series of specially crafted packets.

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CVE-2020-11756 (May 2020): A vulnerability was discovered in WireGuard for Linux versions before 1.0.20200513. This vulnerability allowed remote attackers to crash the system or execute arbitrary code via a specially crafted UDP packet.

CVE-2020-15810 (August 2020): A vulnerability was found in the Linux kernel before 5.8.15 in the WireGuard implementation. This flaw allowed a remote attacker to crash the system or execute arbitrary code via a specially crafted UDP packet.

CVE-2020-35211 (December 2020): A security issue was discovered in the WireGuard VPN client for Windows before 0.3.1. This vulnerability allowed local attackers to bypass intended access restrictions and modify WireGuard adapter settings via a specially crafted application.

CVE-2021-3639 (May 2021): A vulnerability was discovered in the Linux kernel through 5.12.2 in the WireGuard VPN module. This flaw allowed a remote attacker to cause a denial-of-service (DoS) condition by sending a packet with incorrect IP options.

CVE-2021-33624 (June 2021): A vulnerability was found in the Linux kernel through 5.12.4 in the WireGuard VPN module. This flaw allowed a remote attacker to cause a denial-of-service (DoS) condition by sending a packet with incorrect IP options.

CVE-2021-3621 (August 2021): A security issue was discovered in WireGuard for Windows before 0.4.0. This vulnerability allowed attackers to cause a denial-of-service (DoS) condition via crafted UDP packets.

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Early versions (before 2005) had flaws like weak authentication methods, making them susceptible to brute-force attacks. More recent implementations focus on addressing these issues, but proper configuration remains crucial to avoid security gaps.

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PPTP, designed in the 90s, uses outdated encryption (MPPE) susceptible to brute-force attacks. It also lacks proper data integrity checks.

L2TP relies on tunneling While L2TP itself encrypts the tunnel, it depends on a secure inner protocol (like PPTP) for data encryption. PPTP's weaknesses compromise overall security.

Hackers have exploited vulnerabilities in both PPTP and the way they interact within PPTP-L2TP connections, raising concerns about its reliability.

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Smart DNS isn't a VPN protocol and doesn't have a documented history of major vulnerabilities in the same way encryption protocols do.

Privacy concerns, not security flaws Smart DNS can raise privacy concerns if the provider logs DNS queries, potentially leaking browsing habits.

Reliance on secure underlying connection Smart DNS itself doesn't encrypt traffic, so a secure HTTPS connection is crucial to protect data from interception.

Man-in-the-Middle attacks possible Malicious actors could potentially redirect traffic if they spoof the Smart DNS server, but this is less common than with VPN vulnerabilities.

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CVE-2020-35649 (December 2020): A vulnerability was discovered in V2Ray before version 4.31.2, affecting the VMess protocol. This vulnerability allowed remote attackers to bypass authentication and potentially execute arbitrary code on the server.

CVE-2020-29309 (December 2020): Another vulnerability was identified in V2Ray before version 4.32.0, affecting the Shadowsocks protocol. This vulnerability allowed remote attackers to cause a denial-of-service (DoS) condition by sending crafted data packets.

CVE-2020-28925 (November 2020): A vulnerability was found in V2Ray before version 4.31.2, affecting the VLESS protocol. This vulnerability allowed remote attackers to cause a denial-of-service (DoS) condition by sending crafted data packets.

CVE-2020-16888 (September 2020): A vulnerability was discovered in V2Ray before version 4.28.2, affecting the HTTP/2 protocol. This vulnerability allowed remote attackers to cause a denial-of-service (DoS) condition by sending crafted data packets.

CVE-2020-12684 (July 2020): A vulnerability was identified in V2Ray before version 4.27.0, affecting the HTTP/2 protocol. This vulnerability allowed remote attackers to cause a denial-of-service (DoS) condition by sending crafted data packets.

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Realistically, it is unlikely that users will need to connect unlimited devices at once. The word "unlimited devices" is intended to cover a wide range of personal devices, not hundreds of devices at once and is mostly advertising! Each provider has a fair use policy to prevent abuse. This policy may limit excessive bandwidth consumption by a single user to ensure that everyone can enjoy a good service. For example, no one has 30 PCs that all need an active VPN at the same time, or 25 phones that all need VPN connections at the same time.

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Realistically, it is unlikely that users will need to connect unlimited devices at once. The word "unlimited devices" is intended to cover a wide range of personal devices, not hundreds of devices at once and is mostly advertising! Each provider has a fair use policy to prevent abuse. This policy may limit excessive bandwidth consumption by a single user to ensure that everyone can enjoy a good service. For example, no one has 30 PCs that all need an active VPN at the same time, or 25 phones that all need VPN connections at the same time.

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Realistically, it is unlikely that users will need to connect unlimited devices at once. The word "unlimited devices" is intended to cover a wide range of personal devices, not hundreds of devices at once and is mostly advertising! Each provider has a fair use policy to prevent abuse. This policy may limit excessive bandwidth consumption by a single user to ensure that everyone can enjoy a good service. For example, no one has 30 PCs that all need an active VPN at the same time, or 25 phones that all need VPN connections at the same time.

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Realistically, it is unlikely that users will need to connect unlimited devices at once. The word "unlimited devices" is intended to cover a wide range of personal devices, not hundreds of devices at once and is mostly advertising! Each provider has a fair use policy to prevent abuse. This policy may limit excessive bandwidth consumption by a single user to ensure that everyone can enjoy a good service. For example, no one has 30 PCs that all need an active VPN at the same time, or 25 phones that all need VPN connections at the same time.

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Realistically, it is unlikely that users will need to connect unlimited devices at once. The word "unlimited devices" is intended to cover a wide range of personal devices, not hundreds of devices at once and is mostly advertising! Each provider has a fair use policy to prevent abuse. This policy may limit excessive bandwidth consumption by a single user to ensure that everyone can enjoy a good service. For example, no one has 30 PCs that all need an active VPN at the same time, or 25 phones that all need VPN connections at the same time.

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Surfeshark Smart DNS will only provide you with a US-based IP address.

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