CVE-2025-60333 is a stack overflow vulnerability identified in the TOTOLINK N600R router firmware version 4.3.0cu.7866_B20220506. The vulnerability resides in the setWiFiMultipleConfig function, which processes the wepkey2 parameter. Improper handling of this parameter allows an attacker to supply a crafted input that overflows the stack buffer, leading to a Denial of Service (DoS) by crashing or rebooting the device. Stack overflow vulnerabilities typically arise from unsafe memory operations such as unchecked copying of input data into fixed-size buffers. In this case, the vulnerability does not appear to allow remote code execution but can disrupt network availability by rendering the router inoperable. The attack vector involves sending maliciously crafted requests to the router’s configuration interface, which may be accessible locally or remotely depending on device setup. No CVSS score has been assigned yet, and no public exploits have been reported. The lack of patches means affected users must rely on network segmentation and monitoring to mitigate risk until a firmware update is released. This vulnerability impacts the router’s availability, potentially affecting network connectivity for users relying on this device for internet access or internal networking.

For European organizations, exploitation of this vulnerability could lead to temporary loss of network connectivity due to router crashes or reboots, impacting business continuity and productivity. Organizations using TOTOLINK N600R routers in critical network segments or for internet access may experience service disruptions. This could affect small to medium enterprises or home offices that rely on this consumer-grade router. Although the vulnerability does not appear to allow data theft or device takeover, the resulting Denial of Service could interrupt communications, delay operations, and increase support costs. In sectors such as healthcare, finance, or manufacturing where network availability is crucial, even short outages can have significant operational and financial consequences. Additionally, attackers could use this vulnerability as part of a broader attack strategy to degrade network infrastructure or distract security teams. The absence of known exploits reduces immediate risk but does not eliminate the threat of future exploitation.

1. Immediately isolate TOTOLINK N600R routers running the vulnerable firmware from untrusted networks to reduce exposure. 2. Disable remote management interfaces if enabled to prevent remote exploitation. 3. Monitor network traffic for unusual configuration requests targeting the setWiFiMultipleConfig function. 4. Implement network segmentation to limit the impact of a compromised or crashed router on critical systems. 5. Regularly back up router configurations to enable rapid recovery after a crash. 6. Contact TOTOLINK support or check official channels frequently for firmware updates addressing this vulnerability. 7. Consider replacing vulnerable devices with alternative hardware if patches are delayed. 8. Educate network administrators about the vulnerability and signs of exploitation to improve detection and response. 9. Employ intrusion detection systems (IDS) tuned to detect malformed packets or suspicious configuration attempts. 10. Maintain an incident response plan that includes steps for router failure scenarios to minimize downtime.