Denial of service when an attacker sends many SYN packets to create multiple connections without ever sending an ACK to complete the connec…

published 1996-09-19 30 y ago modified 2026-06-16 4 mo ago also EUVD-1999-0116

cvss: 5.0; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 5.6%; EPSS 5.6% chance of exploitation in 30 days, percentile 92%
public exploits: 1; Exploit-DB

Denial of service when an attacker sends many SYN packets to create multiple connections without ever sending an ACK to complete the connection, aka SYN flood.

Timeline

1996-09-19 Published
2002-09-17 First public exploit (EDB-343)

Exploit prediction

5.62% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-343 TCP SYN - 'bang.c' Denial of Service dos, 2002-09-17

CVSS scores

assigned by	version	score	vector
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

References

sunsolve.sun.com /pub-cgi/retrieve.pl?doctype=coll&doc=secbull/136
vendor-advisory

Sources

CVE List CVE-1999-0116
NVD CVE-1999-0116

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary