CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-25791
High (7.5) in bishopfox sliver. EPSS 0.5% chance of exploitation in the next 30 days. Fixed in github.com/bishopfox/sliver 1.6.12.
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.
Severity
- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-306, CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- bishopfox:sliver
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-wxrw-gvg8-fqjp | Go | github.com/bishopfox/sliver | <1.6.12 | 1.6.12 |
| GO-2026-4466 | Go | github.com/bishopfox/sliver | all versions | no fix published |