---
id: CVE-2026-84732
title: >-
  Retransmissions of ACK packet ID in OpenVPN through 2.6.22 and 2.7.6 allow
  remote unauthenticated attackers to cause a denial of service via crafted
  inputs that trigger a timeout integer overflow
summary: >-
  Retransmissions of ACK packet ID in OpenVPN through 2.6.22 and 2.7.6 allow
  remote unauthenticated attackers to cause a denial of service via crafted
  inputs that trigger a timeout integer overflow
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L'
cwe:
  - CWE-190
vendor: OpenVPN
product: OpenVPN
affected:
  - OpenVPN <= 2.6.22
  - OpenVPN <= 2.7.6
published: '2026-09-07'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:07:52.113'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84732'
references:
  - url: 'https://community.openvpn.net/Security%20Announcements/CVE-2026-84732'
    label: security@openvpn.net
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84732.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-84732'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-84732'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84732'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00544
epssPercentile: 0.44372
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-08T15:01:38.566516Z'
cvssSource: cna
scores:
  cna: 8.7
  vendor: 7.5
ingestedAt: '2026-09-08T15:33:26.988Z'
---

## Overview

Retransmissions of ACK packet ID in OpenVPN through 2.6.22 and 2.7.6 allow remote unauthenticated attackers to cause a denial of service via crafted inputs that trigger a timeout integer overflow

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-07 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84732.json)