Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to…
Priority MEDIUM 41CWE-369Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-369.
Summary
Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker to trigger a divide by zero behaviour which could cause an application crash, leading to a denial of service.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01141 66th 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
- Partial
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 – 2.12.1 | — | 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 – 2.12.1 Fixed in — No fix listed CNA
CPE configurations NVD · 6
| 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 | Vulnerable | OpenVPN |
| cpe:2.3:a:openvpn:openvpn_access_server:2.12.0:*:*:*:*:*:*:* | 2.12.0 | Vulnerable | OpenVPN |
| cpe:2.3:a:openvpn:openvpn_access_server:2.12.1:*:*:*:*:*:*:* | 2.12.1 | 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 Vulnerable ·OpenVPN
- cpe:2.3:a:openvpn:openvpn_access_server:2.12.0:*:*:*:*:*:*:* Versions 2.12.0 Vulnerable ·OpenVPN
- cpe:2.3:a:openvpn:openvpn_access_server:2.12.1:*:*:*:*:*:*:* Versions 2.12.1 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-2023-46849
- 2026-10-03 Alias added: GHSA-p99v-qjfm-8vvq
References
Advisory 3
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-2023-25309 Use after free in OpenVPN 2 CVSS 3.1CRITICAL 9.8
- TI-2024-05196 OpenVPN before 2.6.11 does not santize PUSH_REPLY messages properly which an attacker… CVSS 3.1CRITICAL 9.1
Sources
- CVE-2023-46849 · CVE Program
- CVE-2023-46849 · NVD
- FIRST EPSS
- GHSA-p99v-qjfm-8vvq · GitHub Advisory Database · CC BY 4.0
- CVE-2023-46849 · 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