Cisco Security Advisory
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CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
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A vulnerability in the packet filtering features of Cisco SD-WAN Software could allow an unauthenticated, remote attacker to bypass L3 and L4 traffic filters.
The vulnerability is due to improper traffic filtering conditions on an affected device. An attacker could exploit this vulnerability by crafting a malicious packet with specific characteristics and sending it to a targeted device. A successful exploit could allow the attacker to bypass the L3 and L4 traffic filters and inject an arbitrary packet into the network.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cedge-filt-bypass-Y6wZMqm4
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Vulnerable Products
At the time of publication, this vulnerability affected the universal Cisco IOS XE Software releases 17.2.1r and later running in Controller mode. Cisco IOS XE Software releases earlier than the 17.2.1r release are not affected by this vulnerability because they do not include the SD-WAN feature.
At the time of publication, this vulnerability affected the following standalone Cisco IOS XE SD-WAN Software releases: 16.9.1 through 16.9.4, 16.10.1 through 16.10.5, 16.11.1a, and 16.12.2r through 16.12.4.
IMPORTANT: The standalone Cisco IOS XE SD-WAN release images are separate from the universal Cisco IOS XE Software releases. The SD-WAN feature set was first integrated into the universal Cisco IOS XE Software releases starting with IOS XE Software Release 17.2.1r.
Reference documentation: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/install-upgrade-17-2-later.html
See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
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There are no workarounds that address this vulnerability.
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When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories 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 providers.
Fixed Releases
For information about fixed software releases, see the Details section in the bug ID(s) at the top of this advisory.
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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.
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This vulnerability was found during the resolution of a Cisco TAC support case.
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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.
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Show LessVersion Description Section Status Date 1.1 Corrected vulnerable versions. Vulnerable Products Final 2020-DEC-14 1.0 Initial public release. — Final 2020-NOV-04
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