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AUSCERT External Security Bulletin Redistribution
Cisco IOS and Cisco IOS XE Software IPv6 SNMP Message
Handling Denial of Service Vulnerability
7 September 2017
AusCERT Security Bulletin Summary
Product: Cisco IOS and Cisco IOS XE Software IPv6 SNMP
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Existing Account
CVE Names: CVE-2017-12211
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Cisco IOS and Cisco IOS XE Software IPv6 SNMP Message Handling Denial of
Advisory ID: cisco-sa-20170906-snmp
First Published: 2017 September 6 16:00 GMT
Version 1.0: Final
Cisco Bug IDs:
Base 6.3 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
A vulnerability in the IPv6 Simple Network Management Protocol (SNMP) code of
Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote
attacker to cause high CPU usage or a reload of the device.
The vulnerability is due to IPv6 sub block corruption. An attacker could
exploit this vulnerability by polling the affected device IPv6 information. An
exploit could allow the attacker to trigger high CPU usage or a reload of the
There are workarounds that address this vulnerability.
This advisory is available at the following link:
This vulnerability affects Cisco IOS and IOS XE Software. For information
about affected software releases, consult the Cisco bug ID at the top of this
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
The workaround for this vulnerability is to filter object identifiers (OIDs)
that would poll for IPv6 sub block information. For details on employing the
workaround for this vulnerability, consult the Cisco bug ID at the top of this
For information about fixed software releases, consult the Cisco bug ID 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.
This vulnerability was found during the resolution of a support case.
Version Description Section Status Date
1.0 Initial public release. Final 2017-September-06
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
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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