Unauthenticated command execution via unsanitized ttcp_ip
Published Jun 24, 2025 · Updated Jul 22, 2026
OS command injection in Linksys E-Series router firmware allows remote attackers to execute arbitrary commands through an unauthenticated HTTP request. The tmUnblock.cgi and hndUnblock.cgi handlers pass the unsanitized ttcp_ip value into a shell command, so backticks execute attacker-supplied text. Exposure requires reachable HTTP management on port 8080; successful commands run on the router and have been used to install a MIPS worm payload.
Summary
What happened
OS command injection in Linksys E-Series router firmware allows remote attackers to execute arbitrary commands through an unauthenticated HTTP request. The tmUnblock.cgi and hndUnblock.cgi handlers pass the unsanitized ttcp_ip value into a shell command, so backticks execute attacker-supplied text. Exposure requires reachable HTTP management on port 8080; successful commands run on the router and have been used to install a MIPS worm payload.
The record
- CVE
- CVE-2025-34037
- Published
- Jun 24, 2025
- Updated
- Jul 22, 2026
- Vendor
- Linksys
- Product
- Linksys E4200
- Classifications
- CWE-20, CWE-78, CAPEC-88, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 13, 2014Exploitation reportedTheMoon worm exploitation of Linksys E-Series routers
- Feb 6, 2025Exploitation reportedShadowserver exploitation observation
- Jun 24, 2025CVE publishedPublication date reported by the CVE source.
- Jul 22, 2026Record 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 <1.0.06
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
- Linksys E-series Remote Code Executionfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
Technologies
Your stack
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Your stack
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