CVE-1999-0240

Summary

CVE-1999-0240 refers to a vulnerability in certain filters or firewalls that permit fragmented SYN packets with IP reserved bits, despite their established policies forbidding such traffic. This issue can potentially lead to denial-of-service attacks or unauthorized access to networks, as these packets can bypass security checks and evade detection. Fragmented SYN packets are typically used in IP fragment smuggling attacks, which enable attackers to exploit a system's memory or processing power by sending malicious packets. The presence of IP reserved bits in these packets is an indicator of their malicious intent, as these bits should not be used in routable IP addresses. Overall, this vulnerability underscores the importance of updating and configuring network security devices to protect against known threats.

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