CVE-2025-27093 Sliver does not restricted traffic between Wireguard clients.
Sliver C2 framework allows unrestricted traffic between Wireguard clients, enabling implants to attack operators or access port forwards.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-27093?
CVE-2025-27093 is a medium-severity missing authorization vulnerability in BishopFox sliver, published on 28 Oct 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Sliver is a command and control framework that uses a custom Wireguard netstack. In versions 1.5.43 and earlier, and in development version 1.6.0-dev, the netstack does not limit traffic between Wireguard clients. This allows clients to communicate with each other unrestrictedly, potentially enabling leaked or recovered keypairs to be used to attack operators or allowing port forwardings to be accessible from other implants.
Weakness: CWE-284
Which versions are affected by CVE-2025-27093?
5 open source packages ship an affected version, including github.com/bishopfox/sliver and github.com/BishopFox/sliver.
| Package | Affected | Fixed in |
|---|---|---|
github.com/bishopfox/sliver Go | All versions | 1.5.44 |
github.com/bishopfox/sliver Go | All versions | 1.5.44 |
github.com/bishopfox/sliver Go | All versions | 1.5.44 |
github.com/BishopFox/sliver Go | All versions | 1.5.44 |
github.com/BishopFox/sliver Go | All versions | 1.5.44 |
How do I fix CVE-2025-27093?
Upgrade github.com/bishopfox/sliver to 1.5.44 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-27093 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-27093 exists.
Sources
Also known as GHSA-q8j9-34qf-7vq7, GO-2025-4079.