Overview
CVE-2025-8819 is a serious vulnerability that has been identified in various models of Linksys devices. The affected devices include RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000. This vulnerability resides in the setWan function of the /goform/setWan file, enabling potential system compromise or data leakage. The vulnerability is significant due to the potential for remote exploitation. The exploit has been made public, heightening the urgency for users and administrators to apply mitigation measures.
Vulnerability Summary
CVE ID: CVE-2025-8819
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, potential 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 lies in the manipulation of the ‘staticIp’ argument within the setWan function. An attacker can remotely send a specially crafted request to the vulnerable function, causing a stack-based buffer overflow. This overflow can lead to a denial of service or allow an attacker to execute arbitrary code on the compromised system.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. Note that this is a theoretical example and does not represent actual exploit code.
POST /goform/setWan HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
staticIp=AAAA...[long string of A's to overflow buffer]The attacker sends a POST request with a long string of characters as the ‘staticIp’ parameter. This string overflows the buffer, causing the buffer overflow vulnerability.
Countermeasures
The best mitigation strategy is to apply the vendor’s patch, which should eliminate the vulnerability. If the vendor patch is not available or cannot be applied immediately, a temporary solution could be to use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to block malicious requests targeting this vulnerability. However, these are only temporary solutions and do not fully mitigate the risk. The ultimate solution is to apply the vendor patch as soon as it becomes available.