CVE-2025-27090: medium-severity vulnerability in BishopFox sliver
Server-Side Request Forgery (SSRF) in sliver teamserver
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.6%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
BishopFox · sliverRelated CVEs — BishopFox sliver
In the same product, most dangerous first.
CVE-2024-41111HIGHBishopFox Sliver Authenticated Remote Code ExecutionEPSS 0.7%CVE-2026-29781LOWSliver: Authenticated Nil-Pointer Dereference in HandlersEPSS 0.6%CVE-2026-25760MEDIUMWebsite Path Traversal / Arbitrary File Read (Authenticated) in SliverEPSS 0.5%CVE-2026-77622HIGHSliver: Unauthenticated Memory Exhaustion Denial of Service in Sliver HTTP(S) Listener PNG DecoderEPSS 0.5%CVE-2026-25791HIGHSliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of ServiceEPSS 0.4%CVE-2026-34227MEDIUMSliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP InterfaceEPSS 0.4%