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AUSCERT External Security Bulletin Redistribution
Cisco IoT Field Network Director Resource Exhaustion Denial
of Service Vulnerability
24 January 2019
AusCERT Security Bulletin Summary
Product: Cisco IoT Field Network Director
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-1644
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Cisco IoT Field Network Director Resource Exhaustion Denial of Service
Advisory ID: cisco-sa-20190123-iot-fnd-dos
FirstÂ Published: 2019Â JanuaryÂ 23Â 16:00Â GMT
VersionÂ 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvj35124
o A vulnerability in the UDP protocol implementation for Cisco IoT Field
Network Director (IoT-FND) could allow an unauthenticated, remote attacker
to exhaust system resources, resulting in a denial of service (DoS)
The vulnerability is due to improper resource management for UDP ingress
packets. An attacker could exploit this vulnerability by sending a high
rate of UDP packets to an affected system within a short period of time. A
successful exploit could allow the attacker to exhaust available system
resources, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
o Vulnerable Products
This vulnerability affects the following Cisco products:
Connected Grid Network Management System, if running a software
release prior to IoT-FND Release 3.0.
IoT Field Network Director, if running a vulnerable software release.
Refer to the Fixed Releases section of this Advisory for additional
Note: Cisco Connected Grid Network Management System and Cisco IoT Field
Network Director are the same product. Prior to Release 3.0, this product
was named Cisco Connected Grid Network Management System. As of Release
3.0, this product is named Cisco IoT Field Network Director (IoT-FND).
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o Although the DoS condition will end without any manual intervention after
several hours, an attacker can continue to exploit the vulnerability,
resulting in a persistent DoS condition on the vulnerable device.
o There are no workarounds that address this vulnerability.
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the
Cisco Technical Assistance Center (TAC) or their contracted maintenance
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC:
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
Customers are advised to upgrade to an appropriate release as indicated in
the following table:
Cisco FND Software Major First Fixed Release for This Vulnerability
Prior to 4.1.2 Affected; Migrate to a Fixed Release on 4.1.2
4.2.0 Affected; Migrate to a Fixed Release on 4.3.0
4.3.1 and later releases Not affected
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | -- | Final | 2019-January-23 |
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