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AUSCERT External Security Bulletin Redistribution
Cisco IOS XE SD-WAN Software Default Credentials Vulnerability
24 January 2020
AusCERT Security Bulletin Summary
Product: Cisco IOS XE SD-WAN
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Administrator Compromise -- Console/Physical
CVE Names: CVE-2019-1950
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Cisco IOS XE SD-WAN Software Default Credentials Vulnerability
Advisory ID: cisco-sa-sd-wan-cred-EVGSF259
First Published: 2020 January 22 16:00 GMT
Version 1.0: Final
Workarounds: YesCisco Bug IDs: CSCvk59282
A vulnerability in Cisco IOS XE SD-WAN Software could allow an
unauthenticated, local attacker to gain unauthorized access to an affected
The vulnerability is due to the existence of default credentials within the
default configuration of an affected device. An attacker who has access to
an affected device could log in with elevated privileges. A successful
exploit could allow the attacker to take complete control of the device.
Cisco has released software updates that address this vulnerability. There
are workarounds that address this vulnerability.
This advisory is available at the following link:
This vulnerability affects Cisco devices that are running Cisco IOS XE
SD-WAN Software releases 16.11 and earlier.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
To check for the presence of default credentials, customers can use the
show running-configuration | include username admin command within the
Cisco IOS XE SD-WAN Software command line.
To remove the default credentials, customers can use the config-transaction
and no username admin commands.
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
software license: https://www.cisco.com/c/en/us/products/
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: https://www.cisco.com/c
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
Cisco fixed this vulnerability in Cisco IOS XE SD-WAN Software Release
Exploitation and Public Announcements
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.
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2020-JAN-22 |
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