Admin password reset via fixed-size buffer overflow
Published Jul 31, 2025 · Updated Apr 7, 2026
Stack-based buffer overflow in Linksys WRT120N 1.0.07 allows remote attackers to reset the administrator password via an HTTP POST request. The tmUnblock.cgi handler passes the unbounded TM_Block_URL value to an fprintf implementation that uses vsprintf on a 256-byte stack buffer. Reachability is normally limited to the local network because internet-side remote management is disabled by default; exploitation permits blank-password management access.
Summary
What happened
Stack-based buffer overflow in Linksys WRT120N 1.0.07 allows remote attackers to reset the administrator password via an HTTP POST request. The tmUnblock.cgi handler passes the unbounded TM_Block_URL value to an fprintf implementation that uses vsprintf on a 256-byte stack buffer. Reachability is normally limited to the local network because internet-side remote management is disabled by default; exploitation permits blank-password management access.
The record
- CVE
- CVE-2014-125122
- Published
- Jul 31, 2025
- Updated
- Apr 7, 2026
- Vendor
- Linksys
- Product
- WRT120N
- Classifications
- CWE-121, CAPEC-137, CAPEC-100, T1210
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 31, 2025CVE publishedPublication date reported by the CVE source.
- Apr 7, 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=1.0.07
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
- WRT120N 1.0.0.7 Remote Stack Overflowfunctional · demonstrated
- Linksys WRT120N tmUnblock Stack Buffer Overflowfunctional · validated
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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