Use after free in OpenVPN 2
Priority MEDIUM 53CWE-416Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01999 80th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenVPN | OpenVPN 2 (Community) | 2.6.0 – 2.6.6 | — | No fix listed | CNA |
| OpenVPN | Access Server | 2.11.0 – 2.11.3; 2.12.0 – 2.12.2 | — | No fix listed | CNA |
- OpenVPN 2 (Community) VendorOpenVPN Affected 2.6.0 – 2.6.6 Fixed in — No fix listed CNA
- Access Server VendorOpenVPN Affected 2.11.0 – 2.11.3; 2.12.0 – 2.12.2 Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openvpn:openvpn:*:*:*:*:community:*:*:* | 2.6.0 – 2.6.6 | Vulnerable | OpenVPN |
| cpe:2.3:a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:* | 2.11.0 – 2.11.3; 2.12.0 to before 2.12.2 | Vulnerable | OpenVPN |
| cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* | 12.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | 39 | Vulnerable | Fedoraproject |
- cpe:2.3:a:openvpn:openvpn:*:*:*:*:community:*:*:* Versions 2.6.0 – 2.6.6 Vulnerable ·OpenVPN
- cpe:2.3:a:openvpn:openvpn_access_server:*:*:*:*:*:*:*:* Versions 2.11.0 – 2.11.3; 2.12.0 to before 2.12.2 Vulnerable ·OpenVPN
- cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* Versions 39 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2023-46850
- 2026-10-03 Alias added: GHSA-jg57-vh55-3g23
References
More Openvpn vulnerabilities
- TI-2014-04453 Unquoted Windows search path vulnerability in the ptservice service prior to… CVSS 3.1MEDIUM 5.3
- TI-2022-00467 Authentication bypass in OpenVPN CVSS 3.1CRITICAL 9.8
- TI-2024-18509 Unrestricted file upload in OpenVPN 2 CVSS 3.1CRITICAL 9.8
- TI-2024-16468 The interactive service in OpenVPN 2.6.9 and earlier allows the OpenVPN service pipe to… CVSS 3.1HIGH 7.5
- TI-2024-05196 OpenVPN before 2.6.11 does not santize PUSH_REPLY messages properly which an attacker… CVSS 3.1CRITICAL 9.1
- TI-2018-05453 A cross-protocol scripting issue was discovered in the management interface in OpenVPN… CVSS 3.0CRITICAL 9.1
Sources
- CVE-2023-46850 · CVE Program
- CVE-2023-46850 · NVD
- FIRST EPSS
- GHSA-jg57-vh55-3g23 · GitHub Advisory Database · CC BY 4.0
- CVE-2023-46850 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences