Authentication Bypass in Sliver Command and Control Framework by Bishop Fox
CVE-2026-25791

7.5HIGH

Key Information:

Vendor

Bishopfox
Status
Sliver
Vendor
CVE Published:
9 February 2026

What is CVE-2026-25791?

The Sliver command and control framework possesses a vulnerability where its DNS C2 listener accepts unauthenticated TOTP bootstrap messages, creating server-side DNS sessions without verifying OTP values. This issue persists even if the EnforceOTP setting is enabled. Due to the absence of a session cleanup or expiration mechanism, an unauthenticated remote actor can exploit this vulnerability to generate multiple sessions, leading to a potential memory exhaustion condition. This vulnerability has been addressed in version 1.7.0.

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Affected Version(s)

sliver < 1.7.0

References

https://github.com/BishopFox/sliver/security/advisories/G...
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https://github.com/BishopFox/sliver/releases/tag/v1.7.0
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CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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