CVE-2025-2704
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to...
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
- Record
CVE-2025-2704- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
EUVDEUVD-2025-9571
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
- Record
EUVD-2025-9571- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-5gwv-2q72-gxrm
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to...
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
- Record
GHSA-5gwv-2q72-gxrm- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
NVD
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
- Record
CVE-2025-2704- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
OSVALPINE-CVE-2025-2704
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
- Record
ALPINE-CVE-2025-2704- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSV
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
- Record
CVE-2025-2704- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
Show 8 moreShow less
OSVDEBIAN-CVE-2025-2704
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
- Record
DEBIAN-CVE-2025-2704- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2025-1396
openvpn security update
OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. Starting with the fundamental premise that complexity is the enemy of security, OpenVPN offers a cost-effective, lightweight alternative to other VPN technologies that is well-adapted for the SME and enterprise markets.
Security Fix(es):
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase(CVE-2025-2704)
- Record
OESA-2025-1396- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2025-1397
openvpn security update
OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. Starting with the fundamental premise that complexity is the enemy of security, OpenVPN offers a cost-effective, lightweight alternative to other VPN technologies that is well-adapted for the SME and enterprise markets.
Security Fix(es):
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase(CVE-2025-2704)
- Record
OESA-2025-1397- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2025-2704
OpenVPN version 2.6.1 through 2.6.13 in server mode using TLS-crypt-v2 allows remote attackers to trigger a denial of service by corrupting and replaying network packets in the early handshake phase
- Record
UBUNTU-CVE-2025-2704- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVopenSUSE-SU-2025:14979-1 No score
openvpn-2.6.14-1.1 on GA media
These are all security issues fixed in the openvpn-2.6.14-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:14979-1- Updated
- 2026-11-02
OSVSUSE-SU-2025:01508-1 No score
Security update for openvpn
This update for openvpn fixes the following issues:
- CVE-2025-2704: Fixed remote DoS due to possible ASSERT() on OpenVPN servers using --tls-crypt-v2 (bsc#1240392)
- Record
SUSE-SU-2025:01508-1- Updated
- 2026-11-02
OSVSUSE-SU-2025:1508-1 No score
Security update for openvpn
This update for openvpn fixes the following issues:
- CVE-2025-2704: Fixed remote DoS due to possible ASSERT() on OpenVPN servers using --tls-crypt-v2 (bsc#1240392)
- Record
SUSE-SU-2025:1508-1- Updated
- 2026-11-02
OSVUSN-7411-1 No score
openvpn vulnerability
It was discovered that OpenVPN incorrectly handled certain malformed packets. A remote attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service.
- Record
USN-7411-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
openvpnAlpine:v3.19 |
2.6.1 up to 2.6.16-r0 | 2.6.16-r0 |
openvpnAlpine:v3.20 |
2.6.1 up to 2.6.16-r0 | 2.6.16-r0 |
openvpnAlpine:v3.21 |
2.6.1 up to 2.6.14-r0 | 2.6.14-r0 |
openvpnAlpine:v3.22 |
2.6.1 up to 2.6.14-r0 | 2.6.14-r0 |
openvpnAlpine:v3.23 |
2.6.1 up to 2.6.14-r0 | 2.6.14-r0 |
openvpnAlpine:v3.24 |
2.6.1 up to 2.6.14-r0 | 2.6.14-r0 |
openvpnDebian:12 |
before 2.6.3-1+deb12u3, plus listed versions 2.6.3-12.6.3-1+deb12u12.6.3-1+deb12u1~bpo11+12.6.3-1+deb12u22.6.3-1+deb12u2~bpo11+1 |
2.6.3-1+deb12u3 |
openvpnDebian:13 |
before 2.6.14-1 | 2.6.14-1 |
openvpnDebian:14 |
before 2.6.14-1 | 2.6.14-1 |
openvpnopenEuler:24.03-LTS-SP1 |
before 2.6.9-4.oe2403sp1 | 2.6.9-4.oe2403sp1 |
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| Package | Affected | Fixed |
|---|---|---|
openvpnopenEuler:24.03-LTS |
before 2.6.9-4.oe2403 | 2.6.9-4.oe2403 |
openvpnSUSE:Linux Enterprise Module for Basesystem 15 SP7 |
before 2.6.8-150600.3.17.1 | 2.6.8-150600.3.17.1 |
openvpn-dcoSUSE:Linux Enterprise Module for Basesystem 15 SP7 |
before 2.6.8-150600.3.17.1 | 2.6.8-150600.3.17.1 |
openvpnSUSE:Linux Enterprise Module for Basesystem 15 SP6 |
before 2.6.8-150600.3.17.1 | 2.6.8-150600.3.17.1 |
openvpn-dcoSUSE:Linux Enterprise Module for Basesystem 15 SP6 |
before 2.6.8-150600.3.17.1 | 2.6.8-150600.3.17.1 |
openvpnopenSUSE:Leap 15.6 |
before 2.6.8-150600.3.17.1 | 2.6.8-150600.3.17.1 |
openvpn-dcoopenSUSE:Leap 15.6 |
before 2.6.8-150600.3.17.1 | 2.6.8-150600.3.17.1 |
openvpnUbuntu:24.04:LTS |
before 2.6.12-0ubuntu0.24.04.3, plus listed versions 2.6.5-0ubuntu12.6.7-1ubuntu12.6.9-1ubuntu22.6.9-1ubuntu32.6.9-1ubuntu42.6.9-1ubuntu4.12.6.12-0ubuntu0.24.04.1 |
2.6.12-0ubuntu0.24.04.3 |
openvpnopenSUSE:Tumbleweed |
before 2.6.14-1.1 | 2.6.14-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-2704 is a high vulnerability (CVSS 7.5) in Openvpn, published April 2, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.84%, the 58th percentile. Fixed in openvpn 2.6.16-r0.
References
community.openvpn.net/openvpn/wiki/CVE-2025-2704
mail-archive.com/[email protected]/msg00142.html
openwall.com/lists/oss-security/2025/04/02/5
nvd.nist.gov/vuln/detail/CVE-2025-2704
github.com/advisories/GHSA-5gwv-2q72-gxrm
security.alpinelinux.org/vuln/CVE-2025-2704
Show 11 moreShow less
security-tracker.debian.org/tracker/CVE-2025-2704
openeuler.org/zh/security/security-bulletins/detail?id=openEuler-SA-2025-1396
suse.com/support/update/announcement/2025/suse-su-202501508-1
bugzilla.suse.com/1240392
ubuntu.com/security/CVE-2025-2704
cve.org/CVERecord?id=CVE-2025-2704