OpenVPN Access Server up to 2.10 amplification

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

A vulnerability classified as problematic was found in OpenVPN Access Server up to 2.10 (Network Encryption Software). This vulnerability affects an unknown functionality. The manipulation with an unknown input leads to a amplification vulnerability. The CWE definition for the vulnerability is CWE-406. The product does not sufficiently monitor or control transmitted network traffic volume, so that an actor can cause the product to transmit more traffic than should be allowed for that actor. As an impact it is known to affect availability. CVE summarizes:

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.

The weakness was disclosed 07/07/2022. The advisory is available at openvpn.net. This vulnerability was named CVE-2021-4234 since 07/01/2022. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499.002 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Amplification
CWE: CWE-406 / CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/01/2022 🔍
07/07/2022 +6 days 🔍
07/07/2022 +0 days 🔍
07/19/2022 +12 days 🔍

Sourcesinfo

Advisory: openvpn.net
Status: Confirmed

CVE: CVE-2021-4234 (🔍)

Entryinfo

Created: 07/07/2022 09:11 AM
Updated: 07/19/2022 03:05 PM
Changes: 07/07/2022 09:11 AM (37), 07/19/2022 03:05 PM (18)
Complete: 🔍
Cache ID: 18:C37:40

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