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Vulnerability record · CVE-2026-34227 · published 31 March 2026

CVE-2026-34227: Bishopfox sliver missing authentication for critical function vulnerability

Bishopfox · Sliver

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.

5.9 CVSS 4.0 Medium EPSS 0.47% · top 61.9% CWE-306 · Missing authentication for critical functionCWE-942 · CWE-942
5.9CVSS 4.0 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
24 Jul 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm ExploitVendor Advisory
https://github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.1CVE-2023-34758Bishopfox sliver broken cryptographic algorithm vulnerabilitySliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows attackers to execute a man-in-the-middle attack via intercep…EPSS 0.59%7.5CVE-2026-25791Bishopfox sliver missing authentication for critical function vulnerabilitySliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP boo…EPSS 0.51%6.9CVE-2025-27090Bishopfox sliver server-side request forgery (ssrf) vulnerabilitySliver is an open source cross-platform adversary emulation/red team framework, it can be used by organizations of all sizes to perform security test…EPSS 0.63%6.5CVE-2026-25760Bishopfox sliver path traversal vulnerabilitySliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.6.11, a path traversal in the website content subsystem l…EPSS 0.52%5.7CVE-2026-32941Bishopfox sliver allocation without limits vulnerabilitySliver is a command and control framework that uses a custom Wireguard netstack. Versions 1.7.3 and below contain a Remote OOM (Out-of-Memory) vulner…EPSS 0.44%2.1CVE-2026-29781Bishopfox sliver null pointer dereference vulnerabilitySliver 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 Sliv…EPSS 0.52%8.8CVE-2026-67277MikroTik RouterOS btest missing authentication leaks kernel memory and crashes kernelRouterOS accepts a "related" btest connection before the primary session is authenticated, letting an unauthenticated client start an IPv4 UDP test. …KEVEPSS 1.6%analysed8.8CVE-2026-59822LiteLLM MCP endpoint auth bypass via OAuth2 passthrough fallbackLiteLLM's MCP Streamable HTTP endpoint, prior to 1.84.0, let an unauthenticated attacker send a fabricated Authorization header that triggered an OAu…KEVEPSS 0.84%analysed

Source: NIST National Vulnerability Database (record CVE-2026-34227), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.