Unauthenticated network relay via fallback SSH shell
Published Nov 4, 2025 · Updated Nov 4, 2025
Authentication bypass in Abilis CPX before 9.0.7 allows remote attackers to obtain a restricted shell and relay network connections via SSH. When the SSH Control Port has no configured password, three failed logins cause earlier firmware to return to the SSHS shell instead of closing the connection. No credentials or user interaction are required, but exposure is limited to devices left without an SSH password; the shell permits outbound SSH and Telnet sessions that can mask the attacker's source.
Summary
What happened
Authentication bypass in Abilis CPX before 9.0.7 allows remote attackers to obtain a restricted shell and relay network connections via SSH. When the SSH Control Port has no configured password, three failed logins cause earlier firmware to return to the SSHS shell instead of closing the connection. No credentials or user interaction are required, but exposure is limited to devices left without an SSH password; the shell permits outbound SSH and Telnet sessions that can mask the attacker's source.
The record
- CVE
- CVE-2025-35021
- Published
- Nov 4, 2025
- Updated
- Nov 4, 2025
- Vendor
- Abilis
- Product
- Abilis CPX
- Classifications
- CWE-1188, T1090
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 4, 2025CVE publishedPublication date reported by the CVE source.
- Nov 4, 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 <9.0.7
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.
Public exploit references
- runZero SSH fallback-shell demonstrationproof of concept · demonstrated
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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