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CVE
CVE
added 2022/03/18 6:15 p.m.1065 views

CVE-2022-0547

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.

9.8CVSS9.3AI score0.00707EPSS
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added 2017/01/31 10:59 p.m.212 views

CVE-2016-6329

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.

5.9CVSS6.1AI score0.02135EPSS
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added 2021/04/26 2:15 p.m.199 views

CVE-2020-15078

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.

7.5CVSS6.7AI score0.00251EPSS
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CVE
added 2020/04/27 3:15 p.m.198 views

CVE-2020-11810

An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be...

4.3CVSS4.1AI score0.02372EPSS
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added 2013/11/18 2:55 a.m.193 views

CVE-2013-2061

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.

2.6CVSS5.8AI score0.0145EPSS
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CVE
added 2018/03/16 3:29 p.m.141 views

CVE-2018-7544

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 informat...

9.1CVSS7.9AI score0.00398EPSS
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CVE
added 2025/01/06 2:15 p.m.132 views

CVE-2024-5594

OpenVPN before 2.6.11 does not santize PUSH_REPLY messages properly which an attacker controlling the server can use to inject unexpected arbitrary data ending up in client logs.

9.1CVSS9.1AI score0.00181EPSS
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added 2017/05/15 6:29 p.m.113 views

CVE-2017-7479

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.

6.5CVSS6.6AI score0.00811EPSS
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added 2017/05/15 6:29 p.m.100 views

CVE-2017-7478

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.

7.5CVSS7.2AI score0.15234EPSS
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added 2025/04/02 9:15 p.m.98 views

CVE-2025-2704

OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase

7.5CVSS7.2AI score0.00137EPSS
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added 2023/11/11 1:15 a.m.94 views

CVE-2023-46850

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.

9.8CVSS9.6AI score0.02162EPSS
CVE
CVE
added 2017/10/04 1:29 a.m.92 views

CVE-2017-12166

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.

9.8CVSS9.1AI score0.05144EPSS
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added 2017/06/27 1:29 p.m.91 views

CVE-2017-7508

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service when receiving malformed IPv6 packet.

7.5CVSS7.4AI score0.0041EPSS
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added 2017/06/27 1:29 p.m.86 views

CVE-2017-7521

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().

5.9CVSS6.3AI score0.0071EPSS
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added 2017/06/27 1:29 p.m.85 views

CVE-2017-7520

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.

7.4CVSS7.3AI score0.00459EPSS
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added 2014/08/25 4:55 p.m.83 views

CVE-2014-5455

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.

6.9CVSS8.6AI score0.00637EPSS
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added 2025/04/03 4:15 p.m.80 views

CVE-2024-4877

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

8.8CVSS9.5AI score0.00109EPSS
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added 2018/05/01 6:29 p.m.74 views

CVE-2018-9336

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 im...

7.8CVSS8AI score0.00087EPSS
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added 2005/08/24 4:0 a.m.69 views

CVE-2005-2531

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 ...

5CVSS6.4AI score0.0141EPSS
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added 2023/11/11 1:15 a.m.69 views

CVE-2023-46849

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.

7.5CVSS8AI score0.00311EPSS
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added 2024/07/08 10:15 p.m.68 views

CVE-2024-28882

OpenVPN from 2.6.0 through 2.6.10 in a server role accepts multiple exit notifications from authenticated clients which will extend the validity of a closing session

4.3CVSS6.2AI score0.00254EPSS
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added 2006/04/06 10:4 p.m.67 views

CVE-2006-1629

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.

9CVSS7.3AI score0.0356EPSS
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added 2024/07/08 11:15 a.m.66 views

CVE-2024-27903

OpenVPN plug-ins on Windows with OpenVPN 2.6.9 and earlier could be loaded from any directory, which allows an attacker to load an arbitrary plug-in which can be used to interact with the privileged OpenVPN interactive service.

9.8CVSS6.6AI score0.06993EPSS
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added 2005/11/01 12:47 p.m.65 views

CVE-2005-3393

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.

7.5CVSS7.4AI score0.0162EPSS
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added 2023/08/22 7:16 p.m.64 views

CVE-2020-20813

Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service via crafted reset packet.

7.5CVSS7.3AI score0.00613EPSS
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added 2014/12/03 6:59 p.m.63 views

CVE-2014-8104

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.

6.8CVSS5.9AI score0.01465EPSS
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added 2005/11/02 12:2 a.m.57 views

CVE-2005-3409

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.

5CVSS6.2AI score0.02512EPSS
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added 2024/07/08 11:15 a.m.57 views

CVE-2024-27459

The interactive service in OpenVPN 2.6.9 and earlier allows an attacker to send data causing a stack overflow which can be used to execute arbitrary code with more privileges.

7.8CVSS7.9AI score0.05418EPSS
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added 2005/08/24 4:0 a.m.56 views

CVE-2005-2533

OpenVPN before 2.0.1, when running in "dev tap" Ethernet bridging mode, allows remote authenticated clients to cause a denial of service (memory exhaustion) via a flood of packets with a large number of spoofed MAC addresses.

2.1CVSS5.9AI score0.00269EPSS
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added 2024/07/08 11:15 a.m.54 views

CVE-2024-24974

The interactive service in OpenVPN 2.6.9 and earlier allows the OpenVPN service pipe to be accessed remotely, which allows a remote attacker to interact with the privileged OpenVPN interactive service.

7.5CVSS6.6AI score0.09711EPSS
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added 2005/08/24 4:0 a.m.50 views

CVE-2005-2532

OpenVPN before 2.0.1 does not properly flush the OpenSSL error queue when a packet can not be decrypted by the server, which allows remote authenticated attackers to cause a denial of service (client disconnection) via a large number of packets that can not be decrypted.

5CVSS5.9AI score0.01476EPSS
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added 2008/08/04 7:41 p.m.49 views

CVE-2008-3459

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.

7.6CVSS7.3AI score0.00591EPSS
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added 2021/07/02 1:15 p.m.48 views

CVE-2021-3606

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).

7.8CVSS7.6AI score0.00126EPSS
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added 2017/06/27 1:29 p.m.46 views

CVE-2017-7522

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.

6.5CVSS6.7AI score0.00849EPSS
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added 2021/07/12 11:15 a.m.45 views

CVE-2021-3547

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.

7.4CVSS7.4AI score0.00052EPSS
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added 2006/05/05 7:2 p.m.44 views

CVE-2006-2229

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.

4CVSS6.8AI score0.00911EPSS
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added 2005/08/24 4:0 a.m.41 views

CVE-2005-2534

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.

2.6CVSS6.2AI score0.00605EPSS