What’s Vulnerable › Vulnerabilities

CVE-2025-27090: Server-Side Request Forgery (SSRF) in sliver teamserver

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-02-19 · updated 2026-06-17
• Weakness: CWE-918

Description

Sliver is an open source cross-platform adversary emulation/red team framework, it can be used by organizations of all sizes to perform security testing. The reverse port forwarding in sliver teamserver allows the implant to open a reverse tunnel on the sliver teamserver without verifying if the operator instructed the implant to do so. The only impact that has been shown is the exposure of the server's IP address to a third party. This issue has been addressed in version 1.5.43 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• BishopFox sliver: from 1.5.26 before 1.5.43 — fixed in 1.5.43

How to fix

Upgrade to a fixed version: BishopFox sliver 1.5.43. Check the vendor advisory for mitigations.

References

• https://github.com/BishopFox/sliver/commit/0f340a25cf3d496ed870dae7da39eab4427bc16f
• https://github.com/BishopFox/sliver/commit/10e245326070c6a5884a02e0790bb7e2baefb3a1
• https://github.com/BishopFox/sliver/security/advisories/GHSA-fh4v-v779-4g2w

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