CVE-2025-9253 in RE6250
Summary
by MITRE • 08/21/2025
A security vulnerability has been detected in Linksys RE6250, RE6300, RE6350, RE6500, RE7000 and RE9000 1.0.013.001/1.0.04.001/1.0.04.002/1.1.05.003/1.2.07.001. Affected by this issue is the function RP_doSpecifySiteSurvey of the file /goform/RP_doSpecifySiteSurvey. The manipulation of the argument ssidhex leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly 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 • 08/21/2025
This vulnerability affects multiple Linksys router models including RE6250, RE6300, RE6350, RE6500, RE7000, and RE9000 running specific firmware versions. The issue resides in the RP_doSpecifySiteSurvey function within the /goform/RP_doSpecifySiteSurvey file, which processes wireless network scanning parameters. The vulnerability stems from improper input validation of the ssidhex argument, which is used to specify the hexadecimal representation of a wireless network identifier during site survey operations. This function fails to properly bounds-check the input data before copying it into a fixed-size stack buffer, creating a classic stack-based buffer overflow condition that can be exploited through remote network access.
The technical flaw manifests as a stack-based buffer overflow when an attacker supplies a specially crafted ssidhex argument that exceeds the allocated buffer size. This overflow allows arbitrary code execution within the router's memory space, potentially enabling full system compromise. The vulnerability's remote exploitability means attackers can trigger the condition without physical access to the device, making it particularly dangerous for network infrastructure. The disclosed exploit demonstrates that this vulnerability has been actively weaponized in the wild, with public exploitation tools available that can leverage the buffer overflow to gain unauthorized control over affected routers.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete network compromise and potential lateral movement within affected networks. An attacker who successfully exploits this vulnerability could gain administrative access to the router, enabling them to modify network configurations, intercept traffic, redirect connections, or establish persistent backdoors. The affected devices operate as core network infrastructure components, making their compromise particularly damaging to network security posture. The lack of vendor response to early disclosure attempts compounds the risk, leaving users without official patches or mitigation guidance during an active exploitation period. This vulnerability aligns with CWE-121 Stack-based Buffer Overflow and represents a significant threat to enterprise and home network security, particularly when these devices are deployed in environments where network segmentation is insufficient to contain potential breaches.
Recommended mitigations include immediate firmware updates from Linksys if available, network segmentation to isolate affected devices, and implementation of intrusion detection systems to monitor for exploitation attempts. Network administrators should also consider disabling unnecessary remote management features and implementing strong access controls for router administration interfaces. The vulnerability demonstrates the importance of timely security patch management and vendor communication, as the lack of response from Linksys has left users exposed to a known, publicly exploited vulnerability. Organizations should also conduct thorough network assessments to identify all affected devices and implement monitoring for suspicious network activity that may indicate exploitation attempts against these vulnerable router models.