CVE-2020-11810

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.

• CWE-362

• https://bugzilla.suse.com/show_bug.cgi?id=1169925Issue Tracking, Third Party Advisory
• https://community.openvpn.net/openvpn/ticket/1272Exploit, Vendor Advisory
• https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225abPatch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/05/msg00002.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/
• https://patchwork.openvpn.net/patch/1079/Patch, Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-11810Third Party Advisory
• https://bugzilla.suse.com/show_bug.cgi?id=1169925Issue Tracking, Third Party Advisory
• https://community.openvpn.net/openvpn/ticket/1272Exploit, Vendor Advisory
• https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225abPatch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/05/msg00002.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/
• https://patchwork.openvpn.net/patch/1079/Patch, Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2020-11810Third Party Advisory

Published

Apr 27, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2020-11803An issue was discovered in Titan SpamTitan 7.07. Improper sa…8.8
• CVE-2020-11804An issue was discovered in Titan SpamTitan 7.07. Due to impr…8.8
• CVE-2020-11805Pexip Reverse Proxy and TURN Server before 6.1.0 has Incorre…9.8
• CVE-2020-11806In MailStore Outlook Add-in (and Email Archive Outlook Add-i…5.9
• CVE-2020-11807Because of Unrestricted Upload of a File with a Dangerous Ty…7.8
• CVE-2020-1181A remote code execution vulnerability exists in Microsoft Sh…8.8
• CVE-2020-11811In qdPM 9.1, an attacker can upload a malicious .php file to…9.8
• CVE-2020-11812Rukovoditel 2.5.2 is affected by a SQL injection vulnerabili…9.8
• CVE-2020-11813In Rukovoditel 2.5.2, there is a stored XSS vulnerability on…5.4
• CVE-2020-11814A Host Header Injection vulnerability in qdPM 9.1 may allow …5.4
• CVE-2020-11815In Rukovoditel 2.5.2, attackers can upload arbitrary file to…9.8
• CVE-2020-11816Rukovoditel 2.5.2 is affected by a SQL injection vulnerabili…9.8