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Cisco IOS XE Software Auxiliary Asynchronous Port Denial of Service Vulnerability

cisco-sa-aux-333WBz8f · Medium · Published · Updated

A vulnerability in auxiliary asynchronous port (AUX) functions of Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload or stop responding. This vulnerability is due to the incorrect handling of specific ingress traffic when flow control hardware is enabled on the AUX port. An attacker could exploit this vulnerability by reverse telnetting to the AUX port and sending specific data after connecting. A successful exploit could allow the attacker to cause the device to reset or stop responding, resulting in a denial of service (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-aux-333WBz8f This advisory is part of the March 2024 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: March 2024 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication.

Cisco advisory · CSAF JSON

Workarounds

There is a workaround that addresses this vulnerability.

If the AUX port is not being used, it should be disabled, as shown in the following example:

Router# show running-config | section line aux 0
line aux 0
transport input none
transport output none
no exec
Router#

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-2024-20309
Cisco Bug IDsCSCwh47363
CVSS ScoreBase 5.6
Base 5.6 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco IOS XE Software 3.7.0S, 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 3.7.4aS, Cisco IOS XE Software 3.7.2tS, Cisco IOS XE Software 3.7.0xbS, Cisco IOS XE Software 3.7.0bS, Cisco IOS XE Software 3.7.0xaS, Cisco IOS XE Software 3.7.1aS, 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 3.9.1aS, Cisco IOS XE Software 3.9.0aS, Cisco IOS XE Software 3.2.0SE, Cisco IOS XE Software 3.2.1SE, Cisco IOS XE Software 3.2.2SE, Cisco IOS XE Software 3.2.3SE, Cisco IOS XE Software 3.3.0SE, Cisco IOS XE Software 3.3.1SE, Cisco IOS XE Software 3.3.2SE, Cisco IOS XE Software 3.3.3SE, Cisco IOS XE Software 3.3.4SE, Cisco IOS XE Software 3.3.5SE, 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 3.10.2tS, 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 3.12.0aS, 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 3.13.0aS, 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 3.13.6bS, Cisco IOS XE Software 3.13.7aS, 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 3.6.0aE, Cisco IOS XE Software 3.6.2aE, Cisco IOS XE Software 3.6.2E, Cisco IOS XE Software 3.6.5bE, Cisco IOS XE Software 3.6.7aE, Cisco IOS XE Software 3.6.7bE, Cisco IOS XE Software 3.6.9E, Cisco IOS XE Software 3.6.10E, Cisco IOS XE Software 3.6.9aE, 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 3.15.1cS, Cisco IOS XE Software 3.15.3S, Cisco IOS XE Software 3.15.4S, Cisco IOS XE Software 3.3.0SQ, Cisco IOS XE Software 3.3.1SQ, Cisco IOS XE Software 3.4.0SQ, Cisco IOS XE Software 3.4.1SQ, Cisco IOS XE Software 3.5.0SQ, Cisco IOS XE Software 3.5.1SQ, Cisco IOS XE Software 3.5.2SQ, Cisco IOS XE Software 3.5.3SQ, Cisco IOS XE Software 3.5.4SQ, Cisco IOS XE Software 3.5.5SQ, Cisco IOS XE Software 3.5.6SQ, Cisco IOS XE Software 3.5.7SQ, Cisco IOS XE Software 3.5.8SQ, Cisco IOS XE Software 3.16.0S, Cisco IOS XE Software 3.16.1S, Cisco IOS XE Software 3.16.0aS, Cisco IOS XE Software 3.16.1aS, Cisco IOS XE Software 3.16.2S, Cisco IOS XE Software 3.16.2aS, Cisco IOS XE Software 3.16.0bS, Cisco IOS XE Software 3.16.0cS, Cisco IOS XE Software 3.16.3S, Cisco IOS XE Software 3.16.2bS, Cisco IOS XE Software 3.16.3aS, Cisco IOS XE Software 3.16.4S, 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 3.16.4dS, Cisco IOS XE Software 3.16.4eS, 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 16.1.1, Cisco IOS XE Software 16.1.2, Cisco IOS XE Software 16.1.3, 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 16.3.5b, 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 16.5.1a, 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 3.18.0aS, Cisco IOS XE Software 3.18.0S, Cisco IOS XE Software 3.18.1S, Cisco IOS XE Software 3.18.2S, Cisco IOS XE Software 3.18.3S, Cisco IOS XE Software 3.18.4S, Cisco IOS XE Software 3.18.0SP, Cisco IOS XE Software 3.18.1SP, Cisco IOS XE Software 3.18.1aSP, Cisco IOS XE Software 3.18.1gSP, Cisco IOS XE Software 3.18.1bSP, Cisco IOS XE Software 3.18.1cSP, Cisco IOS XE Software 3.18.2SP, Cisco IOS XE Software 3.18.1hSP, Cisco IOS XE Software 3.18.2aSP, Cisco IOS XE Software 3.18.1iSP, Cisco IOS XE Software 3.18.3SP, Cisco IOS XE Software 3.18.4SP, Cisco IOS XE Software 3.18.3aSP, Cisco IOS XE Software 3.18.3bSP, Cisco IOS XE Software 3.18.5SP, Cisco IOS XE Software 3.18.6SP, Cisco IOS XE Software 3.18.7SP, Cisco IOS XE Software 3.18.8aSP, Cisco IOS XE Software 3.18.9SP, 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 16.6.4a, Cisco IOS XE Software 16.6.5a, 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 16.7.1a, Cisco IOS XE Software 16.7.1b, Cisco IOS XE Software 16.7.2, Cisco IOS XE Software 16.7.3, Cisco IOS XE Software 16.7.4, Cisco IOS XE Software 16.8.1, Cisco IOS XE Software 16.8.1a, Cisco IOS XE Software 16.8.1b, Cisco IOS XE Software 16.8.1s, Cisco IOS XE Software 16.8.1c, Cisco IOS XE Software 16.8.1d, Cisco IOS XE Software 16.8.2, Cisco IOS XE Software 16.8.1e, 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 16.9.1a, Cisco IOS XE Software 16.9.1b, Cisco IOS XE Software 16.9.1s, Cisco IOS XE Software 16.9.1c, Cisco IOS XE Software 16.9.1d, Cisco IOS XE Software 16.9.3, Cisco IOS XE Software 16.9.2a, Cisco IOS XE Software 16.9.2s, Cisco IOS XE Software 16.9.3h, Cisco IOS XE Software 16.9.4, Cisco IOS XE Software 16.9.3s, Cisco IOS XE Software 16.9.3a, Cisco IOS XE Software 16.9.4c, Cisco IOS XE Software 16.9.5, Cisco IOS XE Software 16.9.5f, 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 16.10.1b, Cisco IOS XE Software 16.10.1s, Cisco IOS XE Software 16.10.1c, Cisco IOS XE Software 16.10.1e, Cisco IOS XE Software 16.10.1d, Cisco IOS XE Software 16.10.2, Cisco IOS XE Software 16.10.1f, Cisco IOS XE Software 16.10.1g, 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 16.11.1b, 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 16.12.1w, Cisco IOS XE Software 16.12.2, Cisco IOS XE Software 16.12.1y, Cisco IOS XE Software 16.12.2a, 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 16.12.1x, Cisco IOS XE Software 16.12.1t, 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 16.12.1z, Cisco IOS XE Software 16.12.3a, Cisco IOS XE Software 16.12.4a, Cisco IOS XE Software 16.12.5, Cisco IOS XE Software 16.12.6, Cisco IOS XE Software 16.12.1z1, Cisco IOS XE Software 16.12.5a, Cisco IOS XE Software 16.12.5b, Cisco IOS XE Software 16.12.1z2, Cisco IOS XE Software 16.12.6a, Cisco IOS XE Software 16.12.7, Cisco IOS XE Software 16.12.9, Cisco IOS XE Software 16.12.10, Cisco IOS XE Software 16.12.10a, Cisco IOS XE Software 17.1.1, Cisco IOS XE Software 17.1.1a, 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 17.2.1a, 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 17.3.1w, Cisco IOS XE Software 17.3.2a, Cisco IOS XE Software 17.3.1x, Cisco IOS XE Software 17.3.1z, Cisco IOS XE Software 17.3.3a, 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 17.3.4b, Cisco IOS XE Software 17.3.4c, Cisco IOS XE Software 17.3.5a, Cisco IOS XE Software 17.3.5b, Cisco IOS XE Software 17.3.7, Cisco IOS XE Software 17.3.8, Cisco IOS XE Software 17.3.8a, 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 17.4.1c, Cisco IOS XE Software 17.4.2a, 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 17.6.1w, Cisco IOS XE Software 17.6.1a, Cisco IOS XE Software 17.6.1x, Cisco IOS XE Software 17.6.3, Cisco IOS XE Software 17.6.1y, Cisco IOS XE Software 17.6.1z, Cisco IOS XE Software 17.6.3a, Cisco IOS XE Software 17.6.4, Cisco IOS XE Software 17.6.1z1, Cisco IOS XE Software 17.6.5, Cisco IOS XE Software 17.6.6, Cisco IOS XE Software 17.6.6a, 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 17.7.1b, 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 17.10.1b, 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 17.9.1w, Cisco IOS XE Software 17.9.2, Cisco IOS XE Software 17.9.1a, Cisco IOS XE Software 17.9.1x, Cisco IOS XE Software 17.9.1y, Cisco IOS XE Software 17.9.3, Cisco IOS XE Software 17.9.2a, Cisco IOS XE Software 17.9.1x1, Cisco IOS XE Software 17.9.3a, Cisco IOS XE Software 17.9.4, Cisco IOS XE Software 17.9.1y1, Cisco IOS XE Software 17.9.4a, Cisco IOS XE Software 17.11.1, Cisco IOS XE Software 17.11.1a, Cisco IOS XE Software 17.12.1, Cisco IOS XE Software 17.12.1w, Cisco IOS XE Software 17.12.1a, Cisco IOS XE Software 17.12.2, Cisco IOS XE Software 17.12.2a, Cisco IOS XE Software 17.11.99SW, Cisco IOS, Cisco IOS XE Software

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