CVE-2026-25791
HIGHSliver < 1.7.0 - Unauthenticated Memory Exhaustion via DNS C2 Listener Session Allocation
Title source: llmDescription
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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjp
Release Notes x_refsource_misc
https://github.com/BishopFox/sliver/releases/tag/v1.7.0
Scores
CVSS v3
7.5
EPSS
0.0041
EPSS Percentile
32.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-306
CWE-400
Status
published
Products (2)
bishopfox/sliver
< 1.7.0
bishopfox/sliver
0 - 1.6.12Go
Published
Feb 09, 2026
Tracked Since
Feb 18, 2026