CVE-2025-6751 in E8450
Summary
by MITRE • 06/27/2025
A vulnerability, which was classified as critical, was found in Linksys E8450 up to 1.2.00.360516. This affects the function set_device_language of the file portal.cgi of the component HTTP POST Request Handler. The manipulation of the argument dut_language leads to buffer overflow. It is possible to initiate 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 • 06/27/2025
This critical vulnerability exists within the Linksys E8450 router firmware version 1.2.00.360516 and specifically targets the HTTP POST Request Handler component. The flaw resides in the set_device_language function within the portal.cgi file, where improper input validation allows attackers to manipulate the dut_language parameter. This buffer overflow vulnerability represents a significant security risk as it can be exploited remotely without requiring physical access to the device, making it particularly dangerous for widespread deployment scenarios. The vulnerability falls under the CWE-121 buffer overflow category, which is classified as a critical weakness in memory safety. The attack vector is particularly concerning because it leverages HTTP POST requests, which can be easily initiated from any network location, potentially allowing attackers to execute arbitrary code on the affected device. This type of vulnerability aligns with ATT&CK technique T1210, which involves exploiting vulnerabilities in remote services to gain unauthorized access to systems.
The operational impact of this vulnerability extends beyond simple remote code execution, as it could enable attackers to completely compromise the router's functionality and potentially use it as a foothold for broader network attacks. The buffer overflow condition in the HTTP POST Request Handler component could allow an attacker to overwrite critical memory segments, potentially leading to denial of service conditions or complete system compromise. Given that this is a router device, successful exploitation could provide attackers with persistent network access points, enabling them to monitor traffic, redirect connections, or serve as a launching pad for attacks against other devices on the local network. The lack of vendor response to early disclosure attempts is particularly alarming, as it suggests either inadequate security practices or potential delays in addressing critical issues that could affect thousands of users.
Mitigation strategies for this vulnerability should include immediate firmware updates from Linksys if available, as well as network segmentation to limit the potential impact of exploitation. Organizations should implement network monitoring to detect unusual HTTP POST traffic patterns that might indicate exploitation attempts. The vulnerability's classification as critical underscores the importance of proactive security measures, including disabling unnecessary HTTP services when possible and implementing network access controls. Security teams should also consider deploying intrusion detection systems that can identify and block malicious HTTP POST requests targeting this specific vulnerability. Additionally, regular security assessments of network infrastructure should include checks for outdated firmware versions and unpatched devices that may be vulnerable to similar buffer overflow conditions. The public disclosure of this exploit means that threat actors are likely actively targeting vulnerable devices, making immediate remediation essential for maintaining network security posture.