Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer.
Max CVSS
9.8
EPSS Score
0.52%
Published
2023-11-11
Updated
2023-11-29
Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker to trigger a divide by zero behaviour which could cause an application crash, leading to a denial of service.
Max CVSS
7.5
EPSS Score
0.05%
Published
2023-11-11
Updated
2023-11-29
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.
Max CVSS
9.8
EPSS Score
0.50%
Published
2022-03-18
Updated
2022-09-09
OpenVPN before version 2.5.3 on Windows allows local users to load arbitrary dynamic loadable libraries via an OpenSSL configuration file if present, which allows the user to run arbitrary code with the same privilege level as the main OpenVPN process (openvpn.exe).
Max CVSS
7.8
EPSS Score
0.07%
Published
2021-07-02
Updated
2021-07-09
OpenVPN 3 Core Library version 3.6 and 3.6.1 allows a man-in-the-middle attacker to bypass the certificate authentication by issuing an unrelated server certificate using the same hostname found in the verify-x509-name option in a client configuration.
Max CVSS
7.4
EPSS Score
0.09%
Published
2021-07-12
Updated
2022-10-27
OpenVPN 2.5.1 and earlier versions allows a remote attackers to bypass authentication and access control channel data on servers configured with deferred authentication, which can be used to potentially trigger further information leaks.
Max CVSS
7.5
EPSS Score
2.06%
Published
2021-04-26
Updated
2022-08-05
openvpnserv.exe (aka the interactive service helper) in OpenVPN 2.4.x before 2.4.6 allows a local attacker to cause a double-free of memory by sending a malformed request to the interactive service. This could cause a denial-of-service through memory corruption or possibly have unspecified other impact including privilege escalation.
Max CVSS
7.8
EPSS Score
0.04%
Published
2018-05-01
Updated
2018-06-13
A cross-protocol scripting issue was discovered in the management interface in OpenVPN through 2.4.5. When this interface is enabled over TCP without a password, and when no other clients are connected to this interface, attackers can execute arbitrary management commands, obtain sensitive information, or cause a denial of service (SIGTERM) by triggering XMLHttpRequest actions in a web browser. This is demonstrated by a multipart/form-data POST to http://localhost:23000 with a "signal SIGTERM" command in a TEXTAREA element. NOTE: The vendor disputes that this is a vulnerability. They state that this is the result of improper configuration of the OpenVPN instance rather than an intrinsic vulnerability, and now more explicitly warn against such configurations in both the management-interface documentation, and with a runtime warning
Max CVSS
9.1
EPSS Score
0.33%
Published
2018-03-16
Updated
2024-03-21
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.
Max CVSS
9.8
EPSS Score
0.71%
Published
2017-10-04
Updated
2022-05-12
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.
Max CVSS
6.5
EPSS Score
0.29%
Published
2017-06-27
Updated
2017-07-07
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.
Max CVSS
7.4
EPSS Score
0.50%
Published
2017-06-27
Updated
2019-10-03
OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service when receiving malformed IPv6 packet.
Max CVSS
7.5
EPSS Score
1.70%
Published
2017-06-27
Updated
2019-10-03
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.
Max CVSS
6.5
EPSS Score
0.38%
Published
2017-05-15
Updated
2019-10-03
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.
Max CVSS
7.5
EPSS Score
23.58%
Published
2017-05-15
Updated
2017-08-16
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.
Max CVSS
6.8
EPSS Score
0.59%
Published
2014-12-03
Updated
2020-05-12
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.
Max CVSS
6.9
EPSS Score
0.06%
Published
2014-08-25
Updated
2020-06-01
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.
Max CVSS
7.6
EPSS Score
0.38%
Published
2008-08-04
Updated
2017-08-08
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.
Max CVSS
9.0
EPSS Score
0.61%
Published
2006-04-06
Updated
2020-05-12
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.
Max CVSS
7.5
EPSS Score
2.44%
Published
2005-11-01
Updated
2020-05-12
19 vulnerabilities found
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