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AUSCERT External Security Bulletin Redistribution
Cisco Small Business SPA300, SPA500, and SPA51x Series IP
Phones Denial of Service Vulnerability
21 September 2017
AusCERT Security Bulletin Summary
Product: Cisco Small Business SPA300 IP Phone
Cisco Small Business SPA500 IP Phone
Cisco Small Business SPA51x Series IP Phones
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2017-12219
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Cisco Security Advisory
Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones Denial of
Advisory ID: cisco-sa-20170920-spa
First Published: 2017 September 20 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
Base 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
A vulnerability in the handling of IP fragments for the Cisco Small Business
SPA300, SPA500, and SPA51x Series IP Phones could allow an unauthenticated,
remote attacker to cause the device to reload unexpectedly, resulting in a
denial of service (DoS) condition.
The vulnerability is due to the inability to handle many large IP fragments
for reassembly in a short duration. An attacker could exploit this
vulnerability by sending a crafted stream of IP fragments to the targeted
device. An exploit could allow the attacker to cause a DoS condition when the
device unexpectedly reloads.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
This vulnerability affects Cisco Small Business SPA300, SPA500, and SPA51x
Series IP Phones in all software versions. For information about affected
software releases, consult the Cisco bug ID(s) at the top of this advisory.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones are typically
deployed within Small Business/Home (SOHO) network environments. For
additional information about best practices for securing these devices, please
refer to How to Protect Your Voice: Tips on IP Phone Security.
There are no workarounds that address this vulnerability.
For information about fixed software releases, consult the Cisco bug ID(s) at
the top of this advisory.
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
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 providers.
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.
Cisco would like to thank Marc Bolos from Pixelxen for finding and reporting
Version Description Section Status Date
1.0 Initial public release. -- Final 2017-September-20
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
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FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information or
contain factual errors. The information in this document is intended for end
users of Cisco products.
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