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| 4c5d6b | uddr | 2026-09-03 15:45:55 | 1 | # CVE-2026-82312 - Windows local DoS via NULL DACL on service exit event and netsh guard semaphore |
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| 3 | OpenVPN 2.x on Windows created the `--service` exit event and the `netsh.exe` guard semaphore with a NULL DACL, which allows a local user to interfere with other users' openvpn processes by blocking the netsh semaphore or by signalling the exit event, leading to a local denial of service. Only setups not using the interactive service, or using the automatic service to start and stop openvpn, are affected. |
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| 5 | OpenVPN version 2.0.0 through 2.6.22 and 2.7_alpha1 through 2.7.6 are affected. This is fixed in version 2.7.7. |
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| 7 | CVE Record: [CVE-2026-82312](https://www.cve.org/CVERecord?id=CVE-2026-82312) |
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| 9 | Github: |
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| 10 | * [OpenVPN/openvpn-private-issues#167](https://github.com/OpenVPN/openvpn-private-issues/issues/167) |
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| 12 | Release notes: |
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| 13 | * [openvpn-2.7.7](https://community.openvpn.net/ReleaseHistory#openvpn-277-released-3-september-2026) |
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| 15 | Reported-By: DEBRAJ BASAK (https://in.linkedin.com/in/debrajbasak) |