CVE-2025-27090Public exploitNetwork attack vector

Teamserver IP disclosure via unapproved reverse tunnel

Published Feb 19, 2025 · Updated Feb 19, 2025

SSRF in Bishop Fox Sliver 1.5.26 through 1.5.42 allows remote attackers to expose the teamserver's IP address through a reverse tunnel. createReverseTunnelHandler dialed the host and port supplied in implant TunnelData without confirming that an operator had initiated that reverse forward. Exploitation requires mTLS keys for mTLS listeners or a valid nonce for HTTP listeners, and the demonstrated consequence is IP-address disclosure.

CVSS severity6.9
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Bishop Fox Sliver 1.5.26 through 1.5.42 allows remote attackers to expose the teamserver's IP address through a reverse tunnel. createReverseTunnelHandler dialed the host and port supplied in implant TunnelData without confirming that an operator had initiated that reverse forward. Exploitation requires mTLS keys for mTLS listeners or a valid nonce for HTTP listeners, and the demonstrated consequence is IP-address disclosure.

The record

CVE
CVE-2025-27090
Published
Feb 19, 2025
Updated
Feb 19, 2025
Vendor
Bishop Fox
Product
Sliver
Classifications
CWE-918, T1090
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.5.26, < 1.5.43

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Bishop Fox · Sliverversion=>= 1.5.26, < 1.5.43

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9GitHub, Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1090Proxy

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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