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CVE-2026-25791

Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service PUBLISHED

Description (CNA)

Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to 1.7.0, the DNS C2 listener accepts unauthenticated TOTP bootstrap messages and allocates server-side DNS sessions without validating OTP values, even when EnforceOTP is enabled. Because sessions are stored without a cleanup/expiry path in this flow, an unauthenticated remote actor can repeatedly create sessions and drive memory exhaustion. This vulnerability is fixed in 1.7.0.

Affected (CNA)

Vendor / productVersions
BishopFox / sliveraffected < 1.7.0

CWE

CWE-306, CWE-400

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.