# CVE-2022-0547: Auth bypass in OpenVPN > OpenVPN allows authentication bypass when multiple external plugins use deferred replies, granting access with partial credentials. - **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 18 Mar 2022 - **Updated:** 3 Nov 2025 - **Also known as:** ALPINE-CVE-2022-0547, CLSA-2022-1649170601, CLSA-2022-1649170882, CLSA-2022-1649171018, CLSA-2025-1761082098, DEBIAN-CVE-2022-0547, GHSA-g28r-w65r-h89m, MGASA-2022-0123, OESA-2022-1612, SUSE-SU-2022:1024-1, SUSE-SU-2022:1029-1, SUSE-SU-2022:14937-1, SUSE-SU-2022:1934-1, UBUNTU-CVE-2022-0547, USN-5347-1, USN-6850-1, openSUSE-SU-2022:1029-1, openSUSE-SU-2024:11968-1 ## What is CVE-2022-0547? CVE-2022-0547 is a critical authentication bypass vulnerability in Debian Debian Linux, published on 18 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than one of them makes use of deferred authentication replies, which allows an external user to be granted access with only partially correct credentials. Weakness: CWE-287 (Improper Authentication), CWE-305 (Authentication Bypass by Primary Weakness) ## Which versions are affected by CVE-2022-0547? It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `openvpn` | SUSE:Enterprise Storage 6 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Enterprise Storage 7 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:HPE Helion OpenStack 8 | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise High Performance Computing 15 SP2-ESPOS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 2.5.6-150400.3.3.1 | | `openvpn` | SUSE:Linux Enterprise Real Time 15 SP2 | All versions | 2.4.3-150000.5.10.1 | | `openvpn-openssl1` | SUSE:Linux Enterprise Server 11-SECURITY | All versions | 2.3.2-0.10.12.1 | | `openvpn` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise Server 12 SP4-LTSS | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise Server 15 SP1-BCL | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Server 15 SP1-LTSS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Server 15 SP2-BCL | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Server 15 SP2-LTSS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Server 15-LTSS | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:Linux Enterprise Server for SAP Applications 15 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Server for SAP Applications 15 SP1 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Linux Enterprise Server for SAP Applications 15 SP2 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Manager Proxy 4.1 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Manager Retail Branch Server 4.1 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:Manager Server 4.1 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | SUSE:OpenStack Cloud 8 | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:OpenStack Cloud 9 | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:OpenStack Cloud Crowbar 8 | All versions | 2.3.8-16.29.1 | | `openvpn` | SUSE:OpenStack Cloud Crowbar 9 | All versions | 2.3.8-16.29.1 | | `openvpn` | openSUSE:Leap 15.3 | All versions | 2.4.3-150000.5.10.1 | | `openvpn` | openSUSE:Leap 15.4 | All versions | 2.5.6-150400.3.3.1 | | `openvpn` | openSUSE:Tumbleweed | All versions | 2.5.6-1.1 | Products: Debian Debian Linux, Fedoraproject Fedora, Openvpn Openvpn. ## How do I fix CVE-2022-0547? Upgrade to a fixed version. ## Is CVE-2022-0547 being exploited? There is no known exploitation of CVE-2022-0547 in the wild and no public exploit code. ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2022-0547 and fix it if it is affected. What it is: CVE-2022-0547 is a critical authentication bypass vulnerability in Debian Debian Linux, published on 18 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2022-0547 in the wild and no public exploit code. Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2022-0547/ (Markdown: https://insights.sbomify.com/CVE-2022-0547/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2022-0547 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-0547 - OSV: https://osv.dev/vulnerability/CVE-2022-0547 --- From sbomify Insights: https://insights.sbomify.com/CVE-2022-0547/ Summaries are generated and may contain mistakes; the official description above is the record.