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Total 34 CVE
CVE Vendors Products Updated CVSS v3.1
CVE-2024-4877 2 Microsoft, Openvpn 2 Windows, Openvpn 2025-04-29 8.8 High
OpenVPN version 2.4.0 through 2.6.10 on Windows allows an external, lesser privileged process to create a named pipe which the OpenVPN GUI component would connect to allowing it to escalate its privileges
CVE-2022-0547 3 Debian, Fedoraproject, Openvpn 3 Debian Linux, Fedora, Openvpn 2025-04-23 9.8 Critical
OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than one of them makes use of deferred authentication replies, which allows an external user to be granted access with only partially correct credentials.
CVE-2017-7522 1 Openvpn 1 Openvpn 2025-04-20 N/A
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.
CVE-2017-7508 1 Openvpn 1 Openvpn 2025-04-20 N/A
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service when receiving malformed IPv6 packet.
CVE-2017-7520 1 Openvpn 1 Openvpn 2025-04-20 N/A
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service and/or possibly sensitive memory leak triggered by man-in-the-middle attacker.
CVE-2017-7479 1 Openvpn 1 Openvpn 2025-04-20 N/A
OpenVPN versions before 2.3.15 and before 2.4.2 are vulnerable to reachable assertion when packet-ID counter rolls over resulting into Denial of Service of server by authenticated attacker.
CVE-2017-7521 1 Openvpn 1 Openvpn 2025-04-20 N/A
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension().
CVE-2016-6329 1 Openvpn 1 Openvpn 2025-04-20 N/A
OpenVPN, when using a 64-bit block cipher, makes it easier for remote attackers to obtain cleartext data via a birthday attack against a long-duration encrypted session, as demonstrated by an HTTP-over-OpenVPN session using Blowfish in CBC mode, aka a "Sweet32" attack.
CVE-2017-12166 2 Debian, Openvpn 2 Debian Linux, Openvpn 2025-04-20 9.8 Critical
OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability when key-method 1 is used, possibly resulting in code execution.
CVE-2017-7478 1 Openvpn 1 Openvpn 2025-04-20 N/A
OpenVPN version 2.3.12 and newer is vulnerable to unauthenticated Denial of Service of server via received large control packet. Note that this issue is fixed in 2.3.15 and 2.4.2.
CVE-2014-8104 5 Canonical, Debian, Mageia and 2 more 6 Ubuntu Linux, Debian Linux, Mageia and 3 more 2025-04-12 N/A
OpenVPN 2.x before 2.0.11, 2.1.x, 2.2.x before 2.2.3, and 2.3.x before 2.3.6 allows remote authenticated users to cause a denial of service (server crash) via a small control channel packet.
CVE-2014-5455 2 Openvpn, Privatetunnel 2 Openvpn, Privatetunnel 2025-04-12 N/A
Unquoted Windows search path vulnerability in the ptservice service prior to PrivateTunnel version 3.0 (Windows) and OpenVPN Connect version 3.1 (Windows) allows local users to gain privileges via a crafted program.exe file in the %SYSTEMDRIVE% folder.
CVE-2013-2061 2 Opensuse, Openvpn 3 Opensuse, Openvpn, Openvpn Access Server 2025-04-11 N/A
The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier, when running in UDP mode, allows remote attackers to obtain sensitive information via a timing attack involving an HMAC comparison function that does not run in constant time and a padding oracle attack on the CBC mode cipher.
CVE-2008-3459 1 Openvpn 1 Openvpn 2025-04-09 N/A
Unspecified vulnerability in OpenVPN 2.1-beta14 through 2.1-rc8, when running on non-Windows systems, allows remote servers to execute arbitrary commands via crafted (1) lladdr and (2) iproute configuration directives, probably related to shell metacharacters.
CVE-2005-2531 1 Openvpn 1 Openvpn 2025-04-03 N/A
OpenVPN before 2.0.1, when running with "verb 0" and without TLS authentication, does not properly flush the OpenSSL error queue when a client fails certificate authentication to the server and causes the error to be processed by the wrong client, which allows remote attackers to cause a denial of service (client disconnection) via a large number of failed authentication attempts.
CVE-2005-2534 1 Openvpn 1 Openvpn 2025-04-03 N/A
Race condition in OpenVPN before 2.0.1, when --duplicate-cn is not enabled, allows remote attackers to cause a denial of service (server crash) via simultaneous TCP connections from multiple clients that use the same client certificate.
CVE-2005-3393 1 Openvpn 2 Openvpn, Openvpn Access Server 2025-04-03 N/A
Format string vulnerability in the foreign_option function in options.c for OpenVPN 2.0.x allows remote clients to execute arbitrary code via format string specifiers in a push of the dhcp-option command option.
CVE-2005-3409 1 Openvpn 2 Openvpn, Openvpn Access Server 2025-04-03 N/A
OpenVPN 2.x before 2.0.4, when running in TCP mode, allows remote attackers to cause a denial of service (segmentation fault) by forcing the accept function call to return an error status, which leads to a null dereference in an exception handler.
CVE-2006-1629 1 Openvpn 2 Openvpn, Openvpn Access Server 2025-04-03 N/A
OpenVPN 2.0 through 2.0.5 allows remote malicious servers to execute arbitrary code on the client by using setenv with the LD_PRELOAD environment variable.
CVE-2006-2229 1 Openvpn 2 Openvpn, Openvpn Access Server 2025-04-03 N/A
OpenVPN 2.0.7 and earlier, when configured to use the --management option with an IP that is not 127.0.0.1, uses a cleartext password for TCP sessions to the management interface, which might allow remote attackers to view sensitive information or cause a denial of service.