SSH session interception via missing host-key verification
Published Apr 17, 2025 · Updated Apr 17, 2025
Improper host verification in JetBrains Toolbox App before 2.6 allows man-in-the-middle attackers to intercept SSH connections. The SSH plugin establishes a connection without verifying the remote server's host key, so a substituted endpoint is not detected. Exploitation requires user interaction with an SSH connection routed through an attacker-controlled network position and permits limited session data disclosure or modification.
Summary
What happened
Improper host verification in JetBrains Toolbox App before 2.6 allows man-in-the-middle attackers to intercept SSH connections. The SSH plugin establishes a connection without verifying the remote server's host key, so a substituted endpoint is not detected. Exploitation requires user interaction with an SSH connection routed through an attacker-controlled network position and permits limited session data disclosure or modification.
The record
- CVE
- CVE-2025-42921
- Published
- Apr 17, 2025
- Updated
- Apr 17, 2025
- Vendor
- JetBrains
- Product
- Toolbox App
- Classifications
- CWE-297, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 17, 2025CVE publishedPublication date reported by the CVE source.
- Apr 17, 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.
- Affected versionversion=0 <2.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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