CVE-2020-20813
Publication date 22 August 2023
Last updated 28 July 2025
Ubuntu priority
Control Channel in OpenVPN 2.4.7 and earlier allows remote attackers to cause a denial of service via crafted reset packet.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| openvpn | 25.04 plucky | Ignored see notes |
| 24.04 LTS noble | Ignored see notes | |
| 22.04 LTS jammy | Ignored see notes | |
| 20.04 LTS focal | Ignored see notes | |
| 18.04 LTS bionic | Ignored see notes | |
| 16.04 LTS xenial | Ignored see notes | |
| 14.04 LTS trusty | Ignored see notes |
Notes
mdeslaur
There are no details about this issue as of 2024-01-18
nic89
After reaching out to upstream, it doesn't seem to be a CVE they issued or managed. Upstream pointed to some mentions in a chinese blog referring to about reflection attacks using OpenVPN and pointed to those being also independently reported and fixed as CVE-2021-4234 (Most relevant commit ids are b36471148 and 93d8d9231)
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.5 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |