BishopFox Sliver up to 1.7.3 Wireguard Netstack missing authentication

Summaryinfo

A vulnerability identified as critical has been detected in BishopFox Sliver up to 1.7.3. This affects an unknown part of the component Wireguard Netstack. This manipulation causes missing authentication. This vulnerability appears as CVE-2026-34227. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in BishopFox Sliver up to 1.7.3 and classified as critical. Affected by this vulnerability is some unknown functionality of the component Wireguard Netstack. The manipulation with an unknown input leads to a missing authentication vulnerability. The CWE definition for the vulnerability is CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to version 1.7.4, a single click on a malicious link gives an unauthenticated attacker immediate, silent control over every active C2 session or beacon, capable of exfiltrating all collected target data (e.g. SSH keys, ntds.dit) or destroying the entire compromised infrastructure, entirely through the operator's own browser. This issue has been patched in version 1.7.4.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-34227 since 03/26/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.7.4 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• BishopFox

Name

• Sliver

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3

Website

• Product: https://github.com/BishopFox/sliver/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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