How severe is CVE-2025-13086?

CVE-2025-13086 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-13086 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-13086?

CVE-2025-13086 primarily affects Openvpn. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-13086?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-13086 have an EU (EUVD) identifier?

Yes. CVE-2025-13086 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201102.

When was CVE-2025-13086 published?

CVE-2025-13086 was published on 2025-12-03 and last updated on 2026-06-17.

CVE-2025-13086

CVE-2025-13086 is a high-severity vulnerability in Openvpn with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-940.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 4.6
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201102
Weakness: CWE-940
Affected product: Openvpn
Published: 2025-12-03
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2025-13086?: 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
How severe is CVE-2025-13086?: CVE-2025-13086 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-13086 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-13086?: CVE-2025-13086 primarily affects Openvpn. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-13086?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-13086 have an EU (EUVD) identifier?: Yes. CVE-2025-13086 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201102.
When was CVE-2025-13086 published?: CVE-2025-13086 was published on 2025-12-03 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:openvpn:openvpn:*:*:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:alpha1:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:alpha2:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:alpha3:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:beta1:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:beta2:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:beta3:*:*:community:*:*:*
cpe:2.3:a:openvpn:openvpn:2.7:rc1:*:*:community:*:*:*

More vulnerabilities in Openvpn

CVE-2024-27903 — Critical (CVSS 9.8): OpenVPN plug-ins on Windows with OpenVPN 2.6.9 and earlier could be loaded from any directory, which allows an attacker…
CVE-2023-46850 — Critical (CVSS 9.8): Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote…
CVE-2022-0547 — Critical (CVSS 9.8): OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more…
CVE-2017-12166 — Critical (CVSS 9.8): OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability when key-method…
CVE-2025-12106 — Critical (CVSS 9.1): Insufficient argument validation in OpenVPN 2.7_alpha1 through 2.7_rc1 allows an attacker to trigger a heap buffer…
CVE-2024-5594 — Critical (CVSS 9.1): OpenVPN before 2.6.11 does not santize PUSH_REPLY messages properly which an attacker controlling the server can use to…

All CVEs affecting Openvpn →

Other CWE-940 vulnerabilities

CVE-2025-61932 — Critical (CVSS 9.8): Lanscope Endpoint Manager (On-Premises) (Client program (MR) and Detection agent (DA)) improperly verifies the origin…
CVE-2024-38886 — Critical (CVSS 9.8): An issue in Horizon Business Services Inc. Caterease 16.0.1.1663 through 24.0.1.2405 and possibly later versions,…
CVE-2024-40515 — Critical (CVSS 9.8): An issue in SHENZHEN TENDA TECHNOLOGY CO.,LTD Tenda AX2pro V16.03.29.48_cn allows a remote attacker to execute…
CVE-2023-41355 — Critical (CVSS 9.8): Chunghwa Telecom NOKIA G-040W-Q Firewall function has a vulnerability of input validation for ICMP redirect messages.…
CVE-2026-48745 — Critical (CVSS 9.3): Traccar Client is a GPS tracking mobile app for sending location updates to private servers using the open-source…
CVE-2026-33875 — Critical (CVSS 9.3): Gematik Authenticator securely authenticates users for login to digital health applications. Versions prior to 4.16.0…

Browse all CWE-940 vulnerabilities →