Threat Level: green Handler on Duty: Jim Clausing

SANS ISC: Port 500 (tcp/udp) Attack Activity Port 500 (tcp/udp) Attack Activity

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Port Information
Protocol Service Name
tcp isakmp VPN Key Exchange
udp isakmp VPN Key Exchange
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Port diary mentions
Critical Cisco ASA IKEv1v2 Vulnerability. Active Scanning Detected
User Comments
Submitted By Date
PC.Tech 2016-02-13 01:42:50
Per: - 11 Feb 2016 - "... Note that Cisco ASA versions 7.2, 8.2, 8.3, and 8.6 are affected but no-longer-supported by the vendor. Users of these versions should strongly consider migrating to a supported solution..." //
2016-02-11 01:32:24
CVE-2016-1287 - Cisco ASA Software IKEv1 and IKEv2 Buffer Overflow Vulnerability For details see or
Javier Fernandez-Sanguino 2003-05-11 03:20:54
This port might be used by vulnerability CAN-2003-0108 (affects tcpdump) and CAN-2002-1103 (affects the Cisco VPN concentrator) There seems to be increasing scanning in this port (as described in which might be related to the release of a new tool (ike-scan, see
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CVE Links
CVE # Description
CVE-2016-1287 Buffer overflow in the IKEv1 and IKEv2 implementations in Cisco ASA Software before 8.4(7.30), 8.7 before 8.7(1.18), 9.0 before 9.0(4.38), 9.1 before 9.1(7), 9.2 before 9.2(4.5), 9.3 before 9.3(3.7), 9.4 before 9.4(2.4), and 9.5 before 9.5(2.2) on ASA 5500 devices, ASA 5500-X devices, ASA Services Module for Cisco Catalyst 6500 and Cisco 7600 devices, ASA 1000V devices, Adaptive Security Virtual Appliance (aka ASAv), Firepower 9300 ASA Security Module, and ISA 3000 devices allows remote attackers to execute arbitrary code or cause a denial of service (device reload) via crafted UDP packets, aka Bug IDs CSCux29978 and CSCux42019.