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CVE-2026-34227

Bishopfox Sliver authentication bypass

8.8 HIGHPublic exploitEPSS 0.47%
  1. Published31 Mar 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Bishopfox Sliver< 1.7.4

Remediation

Fixed in
Bishopfox Sliver≥ 1.7.4

References

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Frequently asked

Is CVE-2026-34227 being actively exploited?

CVE-2026-34227 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.47%.

How severe is CVE-2026-34227?

CVE-2026-34227 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.47% probability of exploitation.

Which products are affected by CVE-2026-34227?

Affected products include Bishopfox Sliver.

How do I fix CVE-2026-34227?

Upgrade affected software to a fixed version, for example Bishopfox Sliver 1.7.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34227 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.