CVE-2025-27090: sliver SSRF — Exploit & Fix

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
bishopfox	sliver	1.5.26 — 1.5.43

References

Advisories & Patches

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

Exploits

https://github.com/BishopFox/sliver/security/advisories/GHSA-fh4v-v779-4g2w

Frequently Asked Questions

What is CVE-2025-27090? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-27090? +

CVE-2025-27090 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-27090? +

CVE-2025-27090 affects products from bishopfox, specifically: sliver. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-27090? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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