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How the Mentioned CVE Works
The vulnerability CVE-2025-14136 is a stack-based buffer overflow within the `mod_form.so` library of multiple Linksys Wi-Fi range extender models. The flaw resides in the `RE2000v2Repeater_get_wired_clientlist_setClientsName` function, which is responsible for handling wired client name configurations. When this function processes a network request containing data for the `clientsname_0` argument, it fails to perform proper bounds checking. An attacker can exploit this by sending a specially crafted HTTP POST request to the device’s web management interface with an excessively long string for the client name parameter. This malicious input overruns the fixed-size buffer allocated on the function’s stack, corrupting adjacent memory.
The corruption can overwrite the function’s return address stored on the stack. By precisely controlling the overflow data, an attacker can redirect the device’s execution flow to malicious shellcode embedded within the attack payload. Since the vulnerable function is accessible via the web interface, the attack can be launched remotely without authentication. Successful exploitation leads to arbitrary code execution with root privileges, granting the attacker complete control over the affected device. The exploit has been made public, increasing the risk of widespread attacks.
DailyCVE Form
Platform: Linksys RE Series
Version: 1.0.013.001/1.0.04.001/1.0.04.002/1.1.05.003/1.2.07.001
Vulnerability: Stack Buffer Overflow
Severity: Critical
Date: December 2025
Prediction: Patch Expected Q1 2026
What Undercode Say
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`curl -s http://[bash]/api_endpoint | grep -i “clientlist”`
`python3 -c “print(‘A’500)” | nc [bash] 80`
`strings ./mod_form.so | grep -A5 -B5 setClientsName`
`checksec –file=./mod_form.so`
`pattern_create.rb 600`
How Exploit
Craft malicious HTTP POST.
Overflow `clientsname_0` parameter.
Overwrite return address.
Execute shellcode payload.
Gain root shell.
Protection from this CVE
Disable remote administration.
Await vendor firmware patch.
Use network segmentation.
Impact
Remote Code Execution
Full Device Compromise
Network Breach Potential
Permanent Device Damage
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Sources:
Reported By: nvd.nist.gov
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