CVE-2025-15497 Denial of service in OpenVPN
Remote authenticated users can trigger an assertion failure in OpenVPN, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-15497?
CVE-2025-15497 is a low-severity denial of service vulnerability in OpenVPN, published on 30 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Insufficient epoch key slot processing in OpenVPN 2.7_alpha1 through 2.7_rc5 allows remote authenticated users to trigger an assert resulting in a denial of service
Weakness: CWE-617
Which versions are affected by CVE-2025-15497?
How do I fix CVE-2025-15497?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-15497 being exploited?
There is no known exploitation of CVE-2025-15497 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-15497, GHSA-4vwr-5vph-4mjg.