CVE-2026-25791
Last modified
CVE-2026-25791 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.41% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Bishopfox | Sliver | < 1.7.0 |
References
- https://github.com/BishopFox/sliver/releases/tag/v1.7.0Product, Release Notes
- https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjpExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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