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CVE-1999-0077 is a network-side weakness in TCP sequence number generation where the target system uses predictable TCP sequence numbers, including predictable initial sequence numbers, for TCP connections. Because the sequence values can be inferred from prior observations rather than being sufficiently unpredictable, an attacker can predict valid sequence numbers for a spoofed TCP session. The provided context explicitly describes the issue as affecting systems such as Linux Kernel 2.2 and characterizes it as a remote vulnerability. This maps to CWE-342, Predictable Exact Value from Previous Values.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability involving predictable TCP sequence numbers that enables spoofing.
A vulnerability involving predictable TCP initial sequence numbers in Linux Kernel 2.2, which can enable remote TCP session spoofing or hijacking attacks.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.