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AUSCERT External Security Bulletin Redistribution
Cisco Wireless LAN Controller HTTP Parsing Engine Denial of
7 November 2019
AusCERT Security Bulletin Summary
Product: Cisco Wireless LAN Controller
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2019-15276
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Cisco Wireless LAN Controller HTTP Parsing Engine Denial of Service
Advisory ID: cisco-sa-20191106-wlc-dos
First Published: 2019 November 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvp92098
o A vulnerability in the web interface of Cisco Wireless LAN Controller
Software could allow a low-privileged, authenticated, remote attacker to
cause a denial of service (DoS) condition on an affected device.
The vulnerability exists due to a failure of the HTTP parsing engine to
handle specially crafted URLs. An attacker could exploit this vulnerability
by authenticating with low privileges to an affected controller and
submitting the crafted URL to the web interface of the affected device.
Conversely, an unauthenticated attacker could exploit this vulnerability by
persuading a user of the web interface to click the crafted URL. A
successful exploit could allow the attacker to cause an unexpected restart
of the device, 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 Cisco Wireless LAN Controllers running Software
Release 8.4 and later, and earlier than 8.10.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
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
In the following table, the left column lists major Cisco software
releases. The right column indicates the recommended major release which
includes the fix for the vulnerability described in this advisory.
Cisco Wireless LAN Controller Major First Fixed Release
Prior to 8.0 Not vulnerable.
8.0 Not vulnerable.
8.1 Not vulnerable.
8.2 Not vulnerable.
8.3 Not vulnerable.
8.4 To be fixed in future 8.5
8.5 To be fixed in future 8.5
8.8 To be fixed in future 8.8
8.10 Not vulnerable.
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 Cisco would like to thank independent security researcher SecuNinja for
reporting this vulnerability.
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 | 2019-November-06 |
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