# CVE-2026-84732: OpenVPN ACK packet retransmission denial of service

Source: https://junglewise.ai/threats/cve-2026-84732-openvpn-ack-packet-retransmission-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-07. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-84732 · Severity: info · Published 2026-09-07

OpenVPN is widely used to provide secure remote access and site-to-site network connections. A vulnerability in how OpenVPN handles retransmissions of ACK packets can allow remote attackers to cause the service to crash or become unresponsive, disrupting access for legitimate users without needing to authenticate first.

Technologies: [Openvpn](https://junglewise.ai/threats/technologies/openvpn). Vendors: [Openvpn](https://junglewise.ai/threats/vendors/openvpn).

## Quick answers

**Is CVE-2026-84732 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-84732 being exploited in the wild.

**How severe is CVE-2026-84732?** Informational severity, published 7 September 2026.

**Which products and versions are affected?** Openvpn through 2.6.22 and 2.7.6.

**Is there a fix for CVE-2026-84732?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-84732 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-84732?** Check whether you run Openvpn at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in OpenVPN's handling of ACK packet retransmissions, where a timeout integer overflow can be triggered through crafted inputs. An unauthenticated remote attacker can send specially crafted packets over the network to trigger this integer overflow condition, causing a denial of service. The affected versions are OpenVPN 2.6.22 and earlier in the 2.6 series, and 2.7.6 and earlier in the 2.7 series. No patch information is currently available in the advisory.

## Affected products

- OpenVPN OpenVPN through 2.6.22 and 2.7.6

## Timeline

- 2026-09-07: disclosed

## References

- [https://community.openvpn.net/Security%20Announcements/CVE-2026-84732](https://community.openvpn.net/Security%20Announcements/CVE-2026-84732)

## Related threats

- [OpenVPN use-after-free in TLS session promotion or expiry](https://junglewise.ai/threats/cve-2026-84471-the-fix-for-was-incomplete-a-use-after-free-in-openvpn-2-6-0)
- [OpenVPN integer underflow in domain search options](https://junglewise.ai/threats/cve-2026-88964-an-integer-underflow-in-openvpn-version-2-7-alpha3-through-2-7-7)
- [OpenVPN identity impersonation via embedded NUL in certificate subject](https://junglewise.ai/threats/cve-2026-84790-openvpn-2-7-alpha1-through-2-7-7-allows-remote-authenticated)
- [OpenVPN argument parsing vulnerability on Windows](https://junglewise.ai/threats/cve-2026-84256-openvpn-argument-parsing-vulnerability-on-windows)
- [OpenVPN binary planting on Windows](https://junglewise.ai/threats/cve-2026-84226-openvpn-binary-planting-on-windows)