Hash: SHA256

             AUSCERT External Security Bulletin Redistribution

        Cisco Aironet Access Points and Catalyst 9100 Access Points
                  CAPWAP Denial of Service Vulnerability
                              17 October 2019


        AusCERT Security Bulletin Summary

Product:           Cisco Aironet Access Points
                   Cisco Catalyst 9100 Access Points
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-15264  

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

Cisco Aironet Access Points and Catalyst 9100 Access Points CAPWAP Denial of
Service Vulnerability

Priority:        High

Advisory ID:     cisco-sa-20191016-airo-capwap-dos

First Published: 2019 October 16 16:00 GMT

Version 1.0:     Final

Workarounds:     No workarounds available

Cisco Bug IDs:   CSCvo40697



CVSS Score:


  o A vulnerability in the Control and Provisioning of Wireless Access Points
    (CAPWAP) protocol implementation of Cisco Aironet and Catalyst 9100 Access
    Points (APs) could allow an unauthenticated, adjacent attacker to cause an
    affected device to restart unexpectedly, resulting in a denial of service
    (DoS) condition.

    The vulnerability is due to improper resource management during CAPWAP
    message processing. An attacker could exploit this vulnerability by sending
    a high volume of legitimate wireless management frames within a short time
    to an affected device. A successful exploit could allow the attacker to
    cause a device to restart unexpectedly, resulting in a DoS condition for
    clients associated with the AP.

    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:

Affected Products

  o Vulnerable Products

    This vulnerability affects the following Cisco products if they are running
    a vulnerable software release:

       Aironet 1540 Series APs
       Aironet 1560 Series APs
       Aironet 1800 Series APs
       Aironet 2800 Series APs
       Aironet 3800 Series APs
       Aironet 4800 APs
       Catalyst 9100 APs

    Note: For Catalyst 9100 APs, Release is the first supported

    For information about which software releases are vulnerable, see the Fixed
    Software section of this advisory.

    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.

Fixed Software

  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
    software license:

    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

    Fixed Releases

    Customers are advised to upgrade to an appropriate release as indicated in
    the table in this section. To help ensure a complete upgrade solution,
    consider that this advisory is part of a collection that includes the
    following advisories:

       cisco-sa-20191016-airo-capwap-dos : Cisco Aironet Access Points and
        Catalyst 9100 Access Points CAPWAP Denial of Service Vulnerability
       cisco-sa-20191016-airo-pptp-dos : Cisco Aironet Access Points
        Point-to-Point Tunneling Protocol Denial of Service Vulnerability
       cisco-sa-20191016-airo-unauth-access : Cisco Aironet Access Points
        Unauthorized Access Vulnerability
       cisco-sa-20191016-wlc-ssh-dos : Cisco Wireless LAN Controller Secure
        Shell Denial of Service Vulnerability

    In the following table, the left column lists Cisco software releases. The
    center column indicates whether a release is affected by the vulnerability
    described in this advisory and the first release that includes the fix for
    this vulnerability. The right column indicates whether a release is
    affected by all the vulnerabilities described in this collection of
    advisories and which release includes fixes for those vulnerabilities.

    Cisco Aironet AP  First Fixed Release Recommended Release for All
    Software Major    for This            Vulnerabilities Described in the
    Release           Vulnerability       Collection of Advisories
    8.10              Not vulnerable      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 This vulnerability was found by Xiaomei Jia of Cisco 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.


  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/

Revision History

  o +---------+--------------------------+---------+--------+-----------------+
    | Version |       Description        | Section | Status |      Date       |
    | 1.0     | Initial public release.  | -       | Final  | 2019-October-16 |

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
Comment: http://www.auscert.org.au/render.html?it=1967