CVE-2026-29781
MEDIUM
GHSA-hx52-cv84-jr5v
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3Description
Sliver is a command and control framework that uses a custom Wireguard netstack. In versions from 1.7.3 and prior, a vulnerability exists in the Sliver C2 server's Protobuf unmarshalling logic due to a systemic lack of nil-pointer validation. By extracting valid implant credentials and omitting nested fields in a signed message, an authenticated actor can trigger an unhandled runtime panic. Because the mTLS, WireGuard, and DNS transport layers lack the panic recovery middleware present in the HTTP transport, this results in a global process termination. While requiring post-authentication access (a captured implant), this flaw effectively acts as an infrastructure "kill-switch," instantly severing all active sessions across the entire fleet and requiring a manual server restart to restore operations. At time of publication, there are no publicly available patches.
Analysis
Sliver C2 server versions 1.7.3 and earlier can be remotely crashed by authenticated attackers who craft malformed Protobuf messages that exploit missing nil-pointer validation in the unmarshalling logic. Public exploit code exists for this vulnerability, which causes a denial of service affecting all active implant sessions across the entire infrastructure, as the mTLS, WireGuard, and DNS transports lack panic recovery mechanisms. …
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Remediation
Within 30 days: Identify affected systems running versions from 1.7.3 and and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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External POC / Exploit Code
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