Overview
A critical vulnerability, identified as CVE-2025-8826, has been discovered in multiple models of Linksys wireless range extenders. This vulnerability, if successfully exploited, could potentially compromise the system or lead to data leakage. This vulnerability affects a significant number of users globally, given the wide usage of Linksys devices. The urgency of this situation is further escalated due to the existence of a public disclosure of the exploit.
Vulnerability Summary
CVE ID: CVE-2025-8826
Severity: Critical (CVSS: 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Linksys RE6250 | Up to 20250801
Linksys RE6300 | Up to 20250801
Linksys RE6350 | Up to 20250801
Linksys RE6500 | Up to 20250801
Linksys RE7000 | Up to 20250801
Linksys RE9000 | Up to 20250801
How the Exploit Works
The vulnerability resides in the function um_rp_autochannel of the file /goform/RP_setBasicAuto. The manipulation of the argument apcli_AuthMode_2G/apcli_AuthMode_5G can trigger a stack-based buffer overflow. This is due to the software failing to properly handle inputs before storing them in a buffer, leading to a memory corruption and potential execution of arbitrary code.
Conceptual Example Code
An example of how this vulnerability might be exploited could look like this:
POST /goform/RP_setBasicAuto HTTP/1.1
Host: vulnerable-device-ip
Content-Type: application/x-www-form-urlencoded
apcli_AuthMode_2G=AAAAAAAAAA...[long string of A's]...AAAAAAAAAAAAIn this hypothetical example, the attacker sends an HTTP POST request to the /goform/RP_setBasicAuto endpoint with a specially crafted ‘apcli_AuthMode_2G’ parameter. This long string of “A”s is designed to overflow the buffer and potentially execute arbitrary code.
Mitigation
Users of the affected Linksys models are advised to apply the vendor patch as soon as it becomes available. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help mitigate the risk. These systems can be configured to identify and block attempts to exploit this vulnerability.