CVE-2025-8822 in RE6250
Summary
by MITRE • 08/11/2025
A vulnerability has been found in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 up to 20250801. Affected is the function algDisable of the file /goform/setOpMode. The manipulation of the argument opMode leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 09/04/2025
This vulnerability exists in multiple Linksys router models including RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 firmware versions up to 20250801. The flaw is located within the /goform/setOpMode file where the algDisable function processes input parameters. The vulnerability stems from improper input validation of the opMode argument which leads to a stack-based buffer overflow condition. This type of vulnerability falls under CWE-121 which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack vector is remote, meaning an unauthenticated attacker can exploit this vulnerability without requiring physical access to the device or any prior authentication credentials.
The technical implementation of this vulnerability demonstrates a classic buffer overflow scenario where the opMode parameter is processed without adequate length validation or boundary checking. When an attacker supplies a maliciously crafted opMode value that exceeds the allocated buffer size, the excess data overflows into adjacent stack memory regions. This overflow can potentially overwrite return addresses, function pointers, or other critical control data structures within the program's execution context. The stack-based nature of this overflow means that the attack can be particularly dangerous as it allows for arbitrary code execution or system crashes that could lead to persistent denial-of-service conditions.
The operational impact of this vulnerability is significant for network security as it affects enterprise and residential networking equipment that could be targeted by remote attackers. Given that these routers are commonly deployed in home and small office environments, they often serve as entry points for broader network infiltration attempts. The public disclosure of this exploit increases the risk profile substantially, as malicious actors can leverage existing attack frameworks to compromise these devices without requiring specialized knowledge or access. The lack of vendor response to early disclosure attempts further compounds the security risk, leaving affected users without official patches or mitigation guidance during an active vulnerability period.
Organizations and individuals should immediately implement network segmentation strategies to isolate affected devices from critical network segments, particularly when these routers are used as primary network gateways. Network administrators should consider implementing intrusion detection systems with signature-based detection for known exploit patterns targeting this vulnerability. The most effective mitigation approach involves updating firmware to versions that contain proper input validation for the opMode parameter and implementing network access controls that limit exposure to unauthorized remote access. Additionally, monitoring network traffic for unusual patterns that might indicate exploitation attempts can provide early warning indicators of compromise. The vulnerability also highlights the importance of maintaining current firmware updates and implementing robust security practices for network infrastructure devices that are frequently targeted by cybercriminals.