CVE-1999-0445
https://notcve.org/view.php?id=CVE-1999-0445
In Cisco routers under some versions of IOS 12.0 running NAT, some packets may not be filtered by input access list filters. • http://www.osvdb.org/1104 •
CVE-1999-0063 – Cisco IOS 12.0.2 - Syslog Crash
https://notcve.org/view.php?id=CVE-1999-0063
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port. • https://www.exploit-db.com/exploits/19531 https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0063 •
CVE-1999-0157
https://notcve.org/view.php?id=CVE-1999-0157
Cisco PIX firewall and CBAC IP fragmentation attack results in a denial of service. • http://www.osvdb.org/1097 •
CVE-1999-0159
https://notcve.org/view.php?id=CVE-1999-0159
Attackers can crash a Cisco IOS router or device, provided they can get to an interactive prompt (such as a login). This applies to some IOS 9.x, 10.x, and 11.x releases. • https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0159 •