DNS
CVE-2026-25791
HIGH
GHSA-wxrw-gvg8-fqjp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Memory exhaustion in Sliver C2 framework prior to version 1.7.0 allows unauthenticated remote attackers to bypass OTP validation in the DNS listener and create unbounded server-side sessions without expiry mechanisms. Public exploit code exists for this vulnerability, enabling attackers to repeatedly allocate sessions and exhaust server memory resources. The DNS C2 listener accepts bootstrap messages without proper authentication even when OTP enforcement is enabled.
Technical ContextAI
Classified as CWE-306 (Missing Authentication for Critical Function). Affects Sliver. 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.
RemediationAI
Fixed in version 1.7.0.. Restrict network access to the affected service where possible.
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Vendor StatusVendor
SUSE
Severity: High| Product | Status |
|---|---|
| openSUSE Leap 15.6 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.5 | Fixed |
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External POC / Exploit Code
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