CVE-2021-4234

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset packet sent from the client which the client again does not respond to, resulting in a limited amplification attack.

OpenVPN Access Server versiones 2.10 y versiones anteriores, son susceptibles de reenviar múltiples paquetes en respuesta a un paquete de reinicio enviado desde el cliente al que éste no responde de nuevo, resultando en un ataque de amplificación limitada

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2022-07-01 CVE Reserved
2022-07-06 CVE Published
2024-01-27 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-406: Insufficient Control of Network Message Volume (Network Amplification)

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0	2022-07-14

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openvpn Search vendor "Openvpn"		Openvpn Access Server Search vendor "Openvpn" for product "Openvpn Access Server"				< 2.11.0 Search vendor "Openvpn" for product "Openvpn Access Server" and version " < 2.11.0"		-		Affected