description: 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.
problem types: Signal Handler with Functionality that is not Asynchronous-Safe
affected:
{
vendor: Cisco
product: Cisco IOS XE Software
versions:
version: 3.7.0S, status: affected
version: 3.7.1S, status: affected
version: 3.7.2S, status: affected
version: 3.7.3S, status: affected
version: 3.7.4S, status: affected
version: 3.7.5S, status: affected
version: 3.7.6S, status: affected
version: 3.7.7S, status: affected
version: 3.7.4aS, status: affected
version: 3.7.2tS, status: affected
version: 3.7.0bS, status: affected
version: 3.7.1aS, status: affected
version: 3.8.0S, status: affected
version: 3.8.1S, status: affected
version: 3.8.2S, status: affected
version: 3.9.1S, status: affected
version: 3.9.0S, status: affected
version: 3.9.2S, status: affected
version: 3.9.1aS, status: affected
version: 3.9.0aS, status: affected
version: 3.2.0SE, status: affected
version: 3.2.1SE, status: affected
version: 3.2.2SE, status: affected
version: 3.2.3SE, status: affected
version: 3.3.0SE, status: affected
version: 3.3.1SE, status: affected
version: 3.3.2SE, status: affected
version: 3.3.3SE, status: affected
version: 3.3.4SE, status: affected
version: 3.3.5SE, status: affected
version: 3.10.0S, status: affected
version: 3.10.1S, status: affected
version: 3.10.2S, status: affected
version: 3.10.3S, status: affected
version: 3.10.4S, status: affected
version: 3.10.5S, status: affected
version: 3.10.6S, status: affected
version: 3.10.2tS, status: affected
version: 3.10.7S, status: affected
version: 3.10.1xbS, status: affected
version: 3.10.8S, status: affected
version: 3.10.8aS, status: affected
version: 3.10.9S, status: affected
version: 3.10.10S, status: affected
version: 3.11.1S, status: affected
version: 3.11.2S, status: affected
version: 3.11.0S, status: affected
version: 3.11.3S, status: affected
version: 3.11.4S, status: affected
version: 3.12.0S, status: affected
version: 3.12.1S, status: affected
version: 3.12.2S, status: affected
version: 3.12.3S, status: affected
version: 3.12.0aS, status: affected
version: 3.12.4S, status: affected
version: 3.13.0S, status: affected
version: 3.13.1S, status: affected
version: 3.13.2S, status: affected
version: 3.13.3S, status: affected
version: 3.13.4S, status: affected
version: 3.13.5S, status: affected
version: 3.13.2aS, status: affected
version: 3.13.0aS, status: affected
version: 3.13.5aS, status: affected
version: 3.13.6S, status: affected
version: 3.13.7S, status: affected
version: 3.13.6aS, status: affected
version: 3.13.7aS, status: affected
version: 3.13.8S, status: affected
version: 3.13.9S, status: affected
version: 3.13.10S, status: affected
version: 3.6.2aE, status: affected
version: 3.6.2E, status: affected
version: 3.6.5bE, status: affected
version: 3.6.7bE, status: affected
version: 3.6.9E, status: affected
version: 3.6.10E, status: affected
version: 3.14.0S, status: affected
version: 3.14.1S, status: affected
version: 3.14.2S, status: affected
version: 3.14.3S, status: affected
version: 3.14.4S, status: affected
version: 3.15.0S, status: affected
version: 3.15.1S, status: affected
version: 3.15.2S, status: affected
version: 3.15.1cS, status: affected
version: 3.15.3S, status: affected
version: 3.15.4S, status: affected
version: 3.3.0SQ, status: affected
version: 3.3.1SQ, status: affected
version: 3.4.0SQ, status: affected
version: 3.4.1SQ, status: affected
version: 3.5.0SQ, status: affected
version: 3.5.1SQ, status: affected
version: 3.5.2SQ, status: affected
version: 3.5.3SQ, status: affected
version: 3.5.4SQ, status: affected
version: 3.5.5SQ, status: affected
version: 3.5.6SQ, status: affected
version: 3.5.7SQ, status: affected
version: 3.5.8SQ, status: affected
version: 3.16.0S, status: affected
version: 3.16.1S, status: affected
version: 3.16.1aS, status: affected
version: 3.16.2S, status: affected
version: 3.16.2aS, status: affected
version: 3.16.0cS, status: affected
version: 3.16.3S, status: affected
version: 3.16.2bS, status: affected
version: 3.16.3aS, status: affected
version: 3.16.4S, status: affected
version: 3.16.4aS, status: affected
version: 3.16.4bS, status: affected
version: 3.16.5S, status: affected
version: 3.16.4dS, status: affected
version: 3.16.6S, status: affected
version: 3.16.7S, status: affected
version: 3.16.6bS, status: affected
version: 3.16.7aS, status: affected
version: 3.16.7bS, status: affected
version: 3.16.8S, status: affected
version: 3.16.9S, status: affected
version: 3.16.10S, status: affected
version: 3.17.0S, status: affected
version: 3.17.1S, status: affected
version: 3.17.2S, status: affected
version: 3.17.1aS, status: affected
version: 3.17.3S, status: affected
version: 3.17.4S, status: affected
version: 16.1.1, status: affected
version: 16.1.2, status: affected
version: 16.1.3, status: affected
version: 16.2.1, status: affected
version: 16.2.2, status: affected
version: 16.3.1, status: affected
version: 16.3.2, status: affected
version: 16.3.3, status: affected
version: 16.3.1a, status: affected
version: 16.3.4, status: affected
version: 16.3.5, status: affected
version: 16.3.5b, status: affected
version: 16.3.6, status: affected
version: 16.3.7, status: affected
version: 16.3.8, status: affected
version: 16.3.9, status: affected
version: 16.3.10, status: affected
version: 16.3.11, status: affected
version: 16.4.1, status: affected
version: 16.4.2, status: affected
version: 16.4.3, status: affected
version: 16.5.1, status: affected
version: 16.5.1a, status: affected
version: 16.5.1b, status: affected
version: 16.5.2, status: affected
version: 16.5.3, status: affected
version: 3.18.0aS, status: affected
version: 3.18.0S, status: affected
version: 3.18.1S, status: affected
version: 3.18.2S, status: affected
version: 3.18.3S, status: affected
version: 3.18.4S, status: affected
version: 3.18.0SP, status: affected
version: 3.18.1SP, status: affected
version: 3.18.1aSP, status: affected
version: 3.18.1bSP, status: affected
version: 3.18.1cSP, status: affected
version: 3.18.2SP, status: affected
version: 3.18.2aSP, status: affected
version: 3.18.3SP, status: affected
version: 3.18.4SP, status: affected
version: 3.18.3aSP, status: affected
version: 3.18.3bSP, status: affected
version: 3.18.5SP, status: affected
version: 3.18.6SP, status: affected
version: 3.18.7SP, status: affected
version: 3.18.8aSP, status: affected
version: 3.18.9SP, status: affected
version: 16.6.1, status: affected
version: 16.6.2, status: affected
version: 16.6.3, status: affected
version: 16.6.4, status: affected
version: 16.6.5, status: affected
version: 16.6.4a, status: affected
version: 16.6.5a, status: affected
version: 16.6.6, status: affected
version: 16.6.7, status: affected
version: 16.6.8, status: affected
version: 16.6.9, status: affected
version: 16.6.10, status: affected
version: 16.7.1, status: affected
version: 16.7.1a, status: affected
version: 16.7.1b, status: affected
version: 16.7.2, status: affected
version: 16.7.3, status: affected
version: 16.7.4, status: affected
version: 16.8.1, status: affected
version: 16.8.1a, status: affected
version: 16.8.1b, status: affected
version: 16.8.1s, status: affected
version: 16.8.1c, status: affected
version: 16.8.1d, status: affected
version: 16.8.2, status: affected
version: 16.8.1e, status: affected
version: 16.8.3, status: affected
version: 16.9.1, status: affected
version: 16.9.2, status: affected
version: 16.9.1a, status: affected
version: 16.9.1b, status: affected
version: 16.9.1s, status: affected
version: 16.9.3, status: affected
version: 16.9.4, status: affected
version: 16.9.3a, status: affected
version: 16.9.5, status: affected
version: 16.9.5f, status: affected
version: 16.9.6, status: affected
version: 16.9.7, status: affected
version: 16.9.8, status: affected
version: 16.10.1, status: affected
version: 16.10.1a, status: affected
version: 16.10.1b, status: affected
version: 16.10.1s, status: affected
version: 16.10.1c, status: affected
version: 16.10.1e, status: affected
version: 16.10.1d, status: affected
version: 16.10.2, status: affected
version: 16.10.1f, status: affected
version: 16.10.1g, status: affected
version: 16.10.3, status: affected
version: 16.11.1, status: affected
version: 16.11.1a, status: affected
version: 16.11.1b, status: affected
version: 16.11.2, status: affected
version: 16.11.1s, status: affected
version: 16.12.1, status: affected
version: 16.12.1s, status: affected
version: 16.12.1a, status: affected
version: 16.12.1c, status: affected
version: 16.12.1w, status: affected
version: 16.12.2, status: affected
version: 16.12.1y, status: affected
version: 16.12.2a, status: affected
version: 16.12.3, status: affected
version: 16.12.8, status: affected
version: 16.12.2s, status: affected
version: 16.12.1x, status: affected
version: 16.12.1t, status: affected
version: 16.12.4, status: affected
version: 16.12.3s, status: affected
version: 16.12.3a, status: affected
version: 16.12.4a, status: affected
version: 16.12.5, status: affected
version: 16.12.6, status: affected
version: 16.12.1z1, status: affected
version: 16.12.5a, status: affected
version: 16.12.5b, status: affected
version: 16.12.1z2, status: affected
version: 16.12.6a, status: affected
version: 16.12.7, status: affected
version: 16.12.9, status: affected
version: 16.12.10, status: affected
version: 16.12.10a, status: affected
version: 17.1.1, status: affected
version: 17.1.1a, status: affected
version: 17.1.1s, status: affected
version: 17.1.1t, status: affected
version: 17.1.3, status: affected
version: 17.2.1, status: affected
version: 17.2.1r, status: affected
version: 17.2.1a, status: affected
version: 17.2.1v, status: affected
version: 17.2.2, status: affected
version: 17.2.3, status: affected
version: 17.3.1, status: affected
version: 17.3.2, status: affected
version: 17.3.3, status: affected
version: 17.3.1a, status: affected
version: 17.3.1w, status: affected
version: 17.3.2a, status: affected
version: 17.3.1x, status: affected
version: 17.3.1z, status: affected
version: 17.3.4, status: affected
version: 17.3.5, status: affected
version: 17.3.4a, status: affected
version: 17.3.6, status: affected
version: 17.3.4b, status: affected
version: 17.3.4c, status: affected
version: 17.3.5a, status: affected
version: 17.3.5b, status: affected
version: 17.3.7, status: affected
version: 17.3.8, status: affected
version: 17.3.8a, status: affected
version: 17.4.1, status: affected
version: 17.4.2, status: affected
version: 17.4.1a, status: affected
version: 17.4.1b, status: affected
version: 17.4.2a, status: affected
version: 17.5.1, status: affected
version: 17.5.1a, status: affected
version: 17.6.1, status: affected
version: 17.6.2, status: affected
version: 17.6.1w, status: affected
version: 17.6.1a, status: affected
version: 17.6.1x, status: affected
version: 17.6.3, status: affected
version: 17.6.1y, status: affected
version: 17.6.1z, status: affected
version: 17.6.3a, status: affected
version: 17.6.4, status: affected
version: 17.6.1z1, status: affected
version: 17.6.5, status: affected
version: 17.6.6, status: affected
version: 17.6.6a, status: affected
version: 17.6.5a, status: affected
version: 17.7.1, status: affected
version: 17.7.1a, status: affected
version: 17.7.1b, status: affected
version: 17.7.2, status: affected
version: 17.10.1, status: affected
version: 17.10.1a, status: affected
version: 17.10.1b, status: affected
version: 17.8.1, status: affected
version: 17.8.1a, status: affected
version: 17.9.1, status: affected
version: 17.9.1w, status: affected
version: 17.9.2, status: affected
version: 17.9.1a, status: affected
version: 17.9.1x, status: affected
version: 17.9.1y, status: affected
version: 17.9.3, status: affected
version: 17.9.2a, status: affected
version: 17.9.1x1, status: affected
version: 17.9.3a, status: affected
version: 17.9.4, status: affected
version: 17.9.1y1, status: affected
version: 17.9.4a, status: affected
version: 17.11.1, status: affected
version: 17.11.1a, status: affected
version: 17.12.1, status: affected
version: 17.12.1w, status: affected
version: 17.12.1a, status: affected
version: 17.12.2, status: affected
version: 17.12.2a, status: affected
version: 17.11.99SW, status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
baseScore: 5.6
baseSeverity: MEDIUM
attackVector: LOCAL
attackComplexity: HIGH
privilegesRequired: LOW
userInteraction: NONE
scope: CHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
]
exploits: 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.