CVE-2021-4234

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.
Network Amplification
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OpenVPNCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 52%
VendorProductVersion
openvpnopenvpn_access_server
𝑥
< 2.11.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0
https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0