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The vulnerability CVE-2025-14135 is a stack-based buffer overflow within the `AP_get_wired_clientlist_setClientsName` function of the `mod_form.so` library on affected Linksys wireless range extender models. The flaw is triggered when an attacker provides an overly long string for the `clientsname_0` argument during a remote request. This input exceeds the fixed-size buffer allocated on the function’s stack, overwriting adjacent memory. This corruption can lead to a denial of service, arbitrary code execution, or a complete compromise of the device, as the attack can be initiated remotely by an authenticated user.
Platform: Linksys RE Series
Version: 1.0.013.001/1.0.04.001…
Vulnerability: Stack buffer overflow
Severity: High
date: 2025-12-06
Prediction: 2025-Q1 (Estimated)
What Undercode Say:
Analytics
Check for the vulnerable process/module ps aux | grep -i linksys find / -name "mod_form.so" 2>/dev/null Basic strings analysis of the binary strings mod_form.so | grep -i "client"
// Example of vulnerable pattern (conceptual)
int AP_get_wired_clientlist_setClientsName(char clientsname_0) {
char buffer[bash]; // Fixed-size stack buffer
strcpy(buffer, clientsname_0); // No bounds check - overflow occurs here
return 0;
}
How Exploit:
An attacker sends a crafted HTTP POST request to the device’s web management interface containing an abnormally long value (hundreds of bytes) for the `clientsname_0` parameter. This input overflows the function’s fixed-size stack buffer, overwriting the return address on the stack. By precisely controlling this overwritten data with shellcode, the attacker can redirect the device’s execution flow to their malicious code, potentially gaining full control.
Protection from this CVE
1. Isolate devices network.
2. Restrict admin interface access.
3. Monitor for exploit attempts.
Impact:
Full device compromise, remote code execution, denial-of-service.
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Sources:
Reported By: nvd.nist.gov
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