CVE-2020-11810 Race condition in n/a

What is CVE-2020-11810?

CVE-2020-11810 is a low-severity vulnerability in Debian Debian Linux, published on 27 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.

Weakness: CWE-362

Which versions are affected by CVE-2020-11810?

It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Openvpn Openvpn.

How do I fix CVE-2020-11810?

Upgrade to a fixed version.

Is CVE-2020-11810 being exploited?

There is no known exploitation of CVE-2020-11810 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2020-11810, DEBIAN-CVE-2020-11810, GHSA-6crj-vqv7-qq9r, MGASA-2020-0195, OESA-2021-1064, UBUNTU-CVE-2020-11810.