Home/CVE/OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset pac
CVE

CVE-2021-4234

OpenVPN Access Server 2.10 and prior versions are susceptible to resending multiple packets in a response to a reset pac

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.

HIGH · CVSS 7.5 EPSS 0.00389
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-406Insufficient Control of Network Message Volume (Network Amplification)
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Affected Products & Versions

1
openvpn access server< 2.11.0
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security@openvpn.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 Jul 2022 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0Release NotesVendor Advisory
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