CVE-2021-4234
HIGH
7.5
CVSS Score
Published: July 6, 2022 at 07:10 PM UTC
Updated: June 17, 2026 at 04:19 AM UTC
1 product affected across 1 vendorOpenvpn Access Server
Using OpenVPN Access Server by N/A?
Get instant alerts when new vulnerabilities affect OpenVPN Access Server - before attackers find them.
Real-time alertsTrack your software stackFree plan available
Severity
HIGH7.5
Exploit prediction
EPSS 0.9%
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v ≤ 2.10
Affected range stops below 2.11.0, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://openvpn.net/vpn-server-resources/release-notes/#openvpn-access-server-2-11-0CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-406NVD-CWE-Other
Get alerted
Stop reading CVE feeds looking for your own stack
Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.
Free plan, no card