OpenVPN: OpenVPN: Improper validation of source IP addresses leads to denial of service
Published Dec 3, 2025
4.6
MEDIUMCVSS 4.0
EPSS 0.64%
Description
Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.6.15 and 2.7_alpha1 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client
Affected products
-
- Version 2.6.0StatusaffectedConstraints<=2.6.15
- Version 2.7_alpha1StatusaffectedConstraints<=2.7_rc1
- Version
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Red Hat statement
This vulnerability is rated Moderate for Red Hat. Improper validation of source IP addresses in OpenVPN allows an attacker to open a session from a different IP address, leading to a denial of service for the originating client. This affects OpenVPN deployments where client source IP address validation is critical for session integrity.
Red Hat mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Metrics
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Dec 3, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.64% (0.00641) | 48.91th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.61% (0.00610) | 44.33th | v5 (v2026.06.15) |
| Dec 4, 2025 | 0.04% (0.00039) | 11.17th | v4 (v2025.03.14) |
References (7)
- https://access.redhat.com/security/cve/CVE-2025-13086 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2418671 Issue Tracking
- https://community.openvpn.net/Security%20Announcements/CVE-2025-13086 vendor-advisoryVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-13086
- https://www.cve.org/CVERecord?id=CVE-2025-13086
- https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00151.html release-notesMailing ListRelease Notes
- https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00152.html release-notesMailing ListRelease Notes
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2025-13086 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2418671 | Issue Tracking | |
| https://community.openvpn.net/Security%20Announcements/CVE-2025-13086 | vendor-advisoryVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2025-13086 | ||
| https://www.cve.org/CVERecord?id=CVE-2025-13086 | ||
| https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00151.html | release-notesMailing ListRelease Notes | |
| https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00152.html | release-notesMailing ListRelease Notes |
Change history (0)
No recorded changes yet.