OpenVPN Access Server up to 2.10 amplification

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.4$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in OpenVPN Access Server up to 2.10. Affected by this vulnerability is an unknown functionality. Executing a manipulation can lead to amplification. This vulnerability is tracked as CVE-2021-4234. The attack can be launched remotely. No exploit exists.

Detailsinfo

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.

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Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: 🔍

Physical: No
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 (🔍)
GCVE (CVE): GCVE-0-2021-4234
GCVE (VulDB): GCVE-100-203302

Entryinfo

Created: 07/07/2022 09:11
Updated: 07/19/2022 15:05
Changes: 07/07/2022 09:11 (37), 07/19/2022 15:05 (18)
Complete: 🔍
Cache ID: 216::103

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