SSRF in Bishopfox Sliver
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
EPSS: 0.006 (45.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Bishopfox Sliver — versions >= 1.5.26, < 1.5.43
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-27090?
- CVE-2025-27090 is a medium-severity vulnerability in Bishopfox Sliver, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.3/10. Published 2025-02-19.
- How severe is CVE-2025-27090?
- Medium severity. CVSS v3 base score is 5.3 out of 10.