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Cisco IOS XE Software for ASR 1000 Series Aggregation Services Routers IPv6 Multicast Denial of Service Vulnerability

cisco-sa-mlre-H93FswRz · High · Published · Updated

A vulnerability in the Multicast Leaf Recycle Elimination (mLRE) feature of Cisco IOS XE Software for Cisco ASR 1000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.  This vulnerability is due to incorrect handling of certain IPv6 multicast packets when they are fanned out more than seven times on an affected device. An attacker could exploit this vulnerability by sending a specific IPv6 multicast or IPv6 multicast VPN (MVPNv6) packet through the affected device. A successful exploit could allow the attacker to cause a reload of the affected device, resulting in a DoS condition. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-mlre-H93FswRz This advisory is part of the September 2023 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.

Cisco advisory · CSAF JSON

Workarounds

Administrators may disable mLRE on an affected device, as shown in the following example:

Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#platform multicast lre off
Router(config)#end
Router#show platform hardware qfp active feature multicast lre
=== mcast lre config ===
Platform v4mcast LRE config: Off
Platform v6mcast LRE config: Off
Router#

When the mLRE feature is disabled, packets are processed separately for the different interfaces that replicate multicast traffic. For more information on mLRE and the impact of disabling it, see mLRE Feature on the IOS-XE Router ["https://www.cisco.com/c/en/us/support/docs/ip/multicast/215632-mlre-feature-on-the-ios-xe-router.html"].

While this workaround has been deployed and was proven successful in a test environment, customers should determine the applicability and effectiveness in their own environment and under their own use conditions. Customers should be aware that any workaround or mitigation that is implemented may negatively impact the functionality or performance of their network based on intrinsic customer deployment scenarios and limitations. Customers should not deploy any workarounds or mitigations before first evaluating the applicability to their own environment and any impact to such environment.

CVEsCVE-2023-20187
Cisco Bug IDsCSCwe91722
CVSS ScoreBase 8.6
Base 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco IOS XE Software 3.7.1S, Cisco IOS XE Software 3.7.2S, Cisco IOS XE Software 3.7.3S, Cisco IOS XE Software 3.7.4S, Cisco IOS XE Software 3.7.5S, Cisco IOS XE Software 3.7.6S, Cisco IOS XE Software 3.7.7S, Cisco IOS XE Software 3.7.8S, Cisco IOS XE Software 3.7.2tS, Cisco IOS XE Software 3.7.0xbS, Cisco IOS XE Software 3.8.0S, Cisco IOS XE Software 3.8.1S, Cisco IOS XE Software 3.8.2S, Cisco IOS XE Software 3.9.1S, Cisco IOS XE Software 3.9.0S, Cisco IOS XE Software 3.9.2S, Cisco IOS XE Software 3.9.0xaS, Cisco IOS XE Software 3.10.0S, Cisco IOS XE Software 3.10.1S, Cisco IOS XE Software 3.10.2S, Cisco IOS XE Software 3.10.3S, Cisco IOS XE Software 3.10.4S, Cisco IOS XE Software 3.10.5S, Cisco IOS XE Software 3.10.6S, Cisco IOS XE Software 3.10.1xcS, Cisco IOS XE Software 3.10.2aS, Cisco IOS XE Software 3.10.7S, Cisco IOS XE Software 3.10.1xbS, Cisco IOS XE Software 3.10.8S, Cisco IOS XE Software 3.10.8aS, Cisco IOS XE Software 3.10.9S, Cisco IOS XE Software 3.10.10S, Cisco IOS XE Software 3.11.1S, Cisco IOS XE Software 3.11.2S, Cisco IOS XE Software 3.11.0S, Cisco IOS XE Software 3.11.3S, Cisco IOS XE Software 3.11.4S, Cisco IOS XE Software 3.12.0S, Cisco IOS XE Software 3.12.1S, Cisco IOS XE Software 3.12.2S, Cisco IOS XE Software 3.12.3S, Cisco IOS XE Software 3.12.4S, Cisco IOS XE Software 3.13.0S, Cisco IOS XE Software 3.13.1S, Cisco IOS XE Software 3.13.2S, Cisco IOS XE Software 3.13.3S, Cisco IOS XE Software 3.13.4S, Cisco IOS XE Software 3.13.5S, Cisco IOS XE Software 3.13.2aS, Cisco IOS XE Software 3.13.5aS, Cisco IOS XE Software 3.13.6S, Cisco IOS XE Software 3.13.7S, Cisco IOS XE Software 3.13.6aS, Cisco IOS XE Software 3.13.8S, Cisco IOS XE Software 3.13.9S, Cisco IOS XE Software 3.13.10S, Cisco IOS XE Software 3.14.0S, Cisco IOS XE Software 3.14.1S, Cisco IOS XE Software 3.14.2S, Cisco IOS XE Software 3.14.3S, Cisco IOS XE Software 3.14.4S, Cisco IOS XE Software 3.15.0S, Cisco IOS XE Software 3.15.1S, Cisco IOS XE Software 3.15.2S, Cisco IOS XE Software 3.15.3S, Cisco IOS XE Software 3.15.4S, Cisco IOS XE Software 3.16.0S, Cisco IOS XE Software 3.16.1aS, Cisco IOS XE Software 3.16.2S, Cisco IOS XE Software 3.16.3S, Cisco IOS XE Software 3.16.2bS, Cisco IOS XE Software 3.16.4aS, Cisco IOS XE Software 3.16.4bS, Cisco IOS XE Software 3.16.4gS, Cisco IOS XE Software 3.16.5S, Cisco IOS XE Software 3.16.4cS, Cisco IOS XE Software 3.16.6S, Cisco IOS XE Software 3.16.5aS, Cisco IOS XE Software 3.16.5bS, Cisco IOS XE Software 3.16.7S, Cisco IOS XE Software 3.16.6bS, Cisco IOS XE Software 3.16.7aS, Cisco IOS XE Software 3.16.7bS, Cisco IOS XE Software 3.16.8S, Cisco IOS XE Software 3.16.9S, Cisco IOS XE Software 3.16.10S, Cisco IOS XE Software 3.16.10aS, Cisco IOS XE Software 3.16.10bS, Cisco IOS XE Software 3.17.0S, Cisco IOS XE Software 3.17.1S, Cisco IOS XE Software 3.17.2S, Cisco IOS XE Software 3.17.1aS, Cisco IOS XE Software 3.17.3S, Cisco IOS XE Software 3.17.4S, Cisco IOS XE Software 16.2.1, Cisco IOS XE Software 16.2.2, Cisco IOS XE Software 16.3.1, Cisco IOS XE Software 16.3.2, Cisco IOS XE Software 16.3.3, Cisco IOS XE Software 16.3.1a, Cisco IOS XE Software 16.3.4, Cisco IOS XE Software 16.3.5, Cisco IOS XE Software 16.3.6, Cisco IOS XE Software 16.3.7, Cisco IOS XE Software 16.3.8, Cisco IOS XE Software 16.3.9, Cisco IOS XE Software 16.3.10, Cisco IOS XE Software 16.3.11, Cisco IOS XE Software 16.4.1, Cisco IOS XE Software 16.4.2, Cisco IOS XE Software 16.4.3, Cisco IOS XE Software 16.5.1, Cisco IOS XE Software 16.5.1b, Cisco IOS XE Software 16.5.2, Cisco IOS XE Software 16.5.3, Cisco IOS XE Software 16.6.1, Cisco IOS XE Software 16.6.2, Cisco IOS XE Software 16.6.3, Cisco IOS XE Software 16.6.4, Cisco IOS XE Software 16.6.5, Cisco IOS XE Software 16.6.4s, Cisco IOS XE Software 16.6.6, Cisco IOS XE Software 16.6.5b, Cisco IOS XE Software 16.6.7, Cisco IOS XE Software 16.6.7a, Cisco IOS XE Software 16.6.8, Cisco IOS XE Software 16.6.9, Cisco IOS XE Software 16.6.10, Cisco IOS XE Software 16.7.1, Cisco IOS XE Software 16.7.2, Cisco IOS XE Software 16.7.3, Cisco IOS XE Software 16.8.1, Cisco IOS XE Software 16.8.1s, Cisco IOS XE Software 16.8.2, Cisco IOS XE Software 16.8.3, Cisco IOS XE Software 16.9.1, Cisco IOS XE Software 16.9.2, Cisco IOS XE Software 16.9.1s, Cisco IOS XE Software 16.9.3, Cisco IOS XE Software 16.9.2s, Cisco IOS XE Software 16.9.4, Cisco IOS XE Software 16.9.3s, Cisco IOS XE Software 16.9.5, Cisco IOS XE Software 16.9.6, Cisco IOS XE Software 16.9.7, Cisco IOS XE Software 16.9.8, Cisco IOS XE Software 16.9.8a, Cisco IOS XE Software 16.9.8b, Cisco IOS XE Software 16.10.1, Cisco IOS XE Software 16.10.1a, Cisco IOS XE Software 16.10.1s, Cisco IOS XE Software 16.10.1e, Cisco IOS XE Software 16.10.2, Cisco IOS XE Software 16.10.3, Cisco IOS XE Software 16.11.1, Cisco IOS XE Software 16.11.1a, Cisco IOS XE Software 16.11.2, Cisco IOS XE Software 16.11.1s, Cisco IOS XE Software 16.11.1c, Cisco IOS XE Software 16.12.1, Cisco IOS XE Software 16.12.1s, Cisco IOS XE Software 16.12.1a, Cisco IOS XE Software 16.12.1c, Cisco IOS XE Software 16.12.2, Cisco IOS XE Software 16.12.3, Cisco IOS XE Software 16.12.8, Cisco IOS XE Software 16.12.2s, Cisco IOS XE Software 16.12.2t, Cisco IOS XE Software 16.12.4, Cisco IOS XE Software 16.12.3s, Cisco IOS XE Software 16.12.5, Cisco IOS XE Software 16.12.6, Cisco IOS XE Software 16.12.7, Cisco IOS XE Software 16.12.10a, Cisco IOS XE Software 17.1.1, Cisco IOS XE Software 17.1.1s, Cisco IOS XE Software 17.1.2, Cisco IOS XE Software 17.1.1t, Cisco IOS XE Software 17.1.3, Cisco IOS XE Software 17.2.1, Cisco IOS XE Software 17.2.1r, Cisco IOS XE Software 17.2.1v, Cisco IOS XE Software 17.2.2, Cisco IOS XE Software 17.2.3, Cisco IOS XE Software 17.3.1, Cisco IOS XE Software 17.3.2, Cisco IOS XE Software 17.3.3, Cisco IOS XE Software 17.3.1a, Cisco IOS XE Software 17.3.4, Cisco IOS XE Software 17.3.5, Cisco IOS XE Software 17.3.4a, Cisco IOS XE Software 17.3.6, Cisco IOS XE Software 17.3.7, Cisco IOS XE Software 17.4.1, Cisco IOS XE Software 17.4.2, Cisco IOS XE Software 17.4.1a, Cisco IOS XE Software 17.4.1b, Cisco IOS XE Software 17.5.1, Cisco IOS XE Software 17.5.1a, Cisco IOS XE Software 17.5.1b, Cisco IOS XE Software 17.5.1c, Cisco IOS XE Software 17.6.1, Cisco IOS XE Software 17.6.2, Cisco IOS XE Software 17.6.1a, Cisco IOS XE Software 17.6.3, Cisco IOS XE Software 17.6.1y, Cisco IOS XE Software 17.6.3a, Cisco IOS XE Software 17.6.4, Cisco IOS XE Software 17.6.5, Cisco IOS XE Software 17.6.5a, Cisco IOS XE Software 17.7.1, Cisco IOS XE Software 17.7.1a, Cisco IOS XE Software 17.7.2, Cisco IOS XE Software 17.10.1, Cisco IOS XE Software 17.10.1a, Cisco IOS XE Software 17.8.1, Cisco IOS XE Software 17.8.1a, Cisco IOS XE Software 17.9.1, Cisco IOS XE Software 17.9.2, Cisco IOS XE Software 17.9.1a, Cisco IOS XE Software 17.9.3, Cisco IOS XE Software 17.9.2a, Cisco IOS XE Software 17.9.3a, Cisco IOS XE Software 17.11.1, Cisco IOS XE Software 17.11.1a, Cisco IOS XE Software

Related Products

Product CVE Evidence
Cisco IOS CVE-2023-20187 Cisco OpenVuln
Cisco IOS XE Software CVE-2023-20187 Cisco OpenVuln
Cisco ASR 1000 Series Aggregation Services Routers CVE-2023-20187 Cisco OpenVuln
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