Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenVPN | OpenVPN 2 (Community) | 2.6.0 – ≤ 2.6.6 | — |
| OpenVPN | Access Server | 2.11.0 – ≤ 2.11.3, 2.12.0 – ≤ 2.12.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openvpn | 2.6.7-1 | — |
| Debian 13 | openvpn | 2.6.7-1 | — |
| Debian 12 | openvpn | 2.6.3-1+deb12u2 | DSA-5555-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openvpn | 2.6.7-1.1 | openSUSE-SU-2024:13429-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | openvpn | 2.6.7-r0 | — |
| Alpine v3.23 | openvpn | 2.6.7-r0 | — |
| Alpine v3.22 | openvpn | 2.6.7-r0 | — |
| Alpine v3.21 | openvpn | 2.6.7-r0 | — |
| Alpine v3.20 | openvpn | 2.6.7-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | openvpn | 2.6.7-r0 | — |
| Alpine v3.18 | openvpn | 2.6.7-r0 | — |
Advisories 3
- DSA-5555-1 openvpn - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:13429-1 openvpn-2.6.7-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2872 OpenVPN: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 22, 2024
References
- https://community.openvpn.net/openvpn/wiki/CVE-2023-46849
- https://openvpn.net/security-advisory/access-server-security-update-cve-2023-46849-cve-2023-46850/
- https://www.debian.org/security/2023/dsa-5555
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L3FS46ANNTAVLIQY56ZKGM5CBTRVBUNE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O54I7D753V6PU6XBU26FEROD2DSHEJQ4/