Overview
The cybersecurity landscape is an ever-evolving battlefield. A vulnerability recently identified, dubbed CVE-2025-9356, has caused quite a stir and is a matter of concern for many. This critical vulnerability affects a range of Linksys extenders namely RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000. These extenders are at risk of a stack-based buffer overflow, a serious threat that could allow remote attackers to execute arbitrary code, potentially compromising the system or leaking sensitive data.
This vulnerability matters because of the widespread use of these Linksys range extenders in home and business environments. Given the remote attack vector, malicious actors could exploit this vulnerability from anywhere in the world, increasing the risk and potential scale of the damage.
Vulnerability Summary
CVE ID: CVE-2025-9356
Severity: High (8.8/10)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Linksys RE6250 | 1.0.013.001
Linksys RE6300 | 1.0.04.001
Linksys RE6350 | 1.0.04.002
Linksys RE6500 | 1.1.05.003
Linksys RE7000 | 1.2.07.001
Linksys RE9000 | 1.2.07.001
How the Exploit Works
The vulnerability lies within the function inboundFilterAdd of the file /goform/inboundFilterAdd. Manipulation of the argument ruleName can lead to a stack-based buffer overflow, a condition where the stack pointer exceeds the stack bound, allowing an attacker to control the execution of the system, possibly leading to system crash or execution of malicious code.
Conceptual Example Code
The following conceptual example illustrates a potential exploitation of this vulnerability. Note that this is a simplified representation, not an actual piece of exploit code.
POST /goform/inboundFilterAdd HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"ruleName": "A"*10000 // This payload overflows the buffer
}In this example, the ruleName is overloaded with a string of ‘A’s, exceeding the buffer capacity. This could cause a buffer overflow, potentially allowing an attacker to execute arbitrary code.