What is CVE-2026-25791?

CVE-2026-25791 is a high-severity vulnerability in Bishopfox Sliver, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-02-09.

How severe is CVE-2026-25791?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Bishopfox Sliver

CVE-2026-25791

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…

Vulnerability class: Broken Authentication

EPSS: 0.000 (8.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Bishopfox Sliver — versions < 1.7.0

Weakness classification (CWE)

References

https://github.com/BishopFox/sliver/security/advisories/GHSA-wxrw-gvg8-fqjp (x_refsource_CONFIRM)
https://github.com/BishopFox/sliver/releases/tag/v1.7.0 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-25791?: CVE-2026-25791 is a high-severity vulnerability in Bishopfox Sliver, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-02-09.
How severe is CVE-2026-25791?: High severity. CVSS v3 base score is 7.5 out of 10.