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_

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HIGH 7.5REMOTEUPGRADE

CVE-2025-13086 is a high-severity flaw (CVSS 7.5) affecting openvpn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 49%)
CISA exploited list	No
Weakness	CWE-940
Published	2025-12-03
Last modified	2026-09-25

Publisher (CNA): OpenVPN Inc. · Vendor: openvpn

Last updated 2026-09-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-03 20:16 UTCPublished CVE record published
2026-09-25 23:10 UTCUpdated Record last modified

openvpn openvpn UPGRADE

Affected: >= 2.6.0 and < 2.6.16 · 2.7 alpha1 · 2.7 alpha2 · 2.7 alpha3 · 2.7 beta1 · 2.7 beta2 · 2.7 beta3 · 2.7 rc1

Fixed in: 2.6.16

Safe to downgrade to: a release before 2.6.0

1. Check installed version

apt-cache policy openvpn || rpm -q openvpn || openvpn --version

2. UPGRADE to 2.6.16 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openvpn

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openvpn

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.6.0 (Debian / Ubuntu)

apt-cache madison openvpn sudo apt install openvpn=<VERSION_BEFORE_2.6.0> sudo apt-mark hold openvpn

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openvpn sudo dnf downgrade openvpn-<VERSION_BEFORE_2.6.0> sudo dnf versionlock add openvpn

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-13086?

openvpn: upgrade to 2.6.16. Exact commands for each OS are on this page.

Is CVE-2025-13086 being exploited?

CVE-2025-13086 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-13086 affect?

CVE-2025-13086 affects openvpn. Severity is high (CVSS 7.5). 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 o

How urgent is CVE-2025-13086?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

Software pages

OpenVPN vulnerabilities

Related CVEs

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CVE-2026-12932 HIGH 8.1 UPGRADE A memory leak in the tls-crypt-v2 client key extraction in OpenVPN 2.5.0 through 2.6.20 and 2.7_alpha1 through
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References

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