description: A vulnerability in the Cisco ACI Multi-Site CloudSec encryption feature of Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, remote attacker to read or modify intersite encrypted traffic.
This vulnerability is due to an issue with the implementation of the ciphers that are used by the CloudSec encryption feature on affected switches. An attacker with an on-path position between the ACI sites could exploit this vulnerability by intercepting intersite encrypted traffic and using cryptanalytic techniques to break the encryption. A successful exploit could allow the attacker to read or modify the traffic that is transmitted between the sites.
Cisco has not released and will not release software updates that address this vulnerability.
problem types: Use of Insufficiently Random Values
affected:
{
vendor: Cisco
product: Cisco NX-OS System Software in ACI Mode
versions:
version: 14.0(1h), status: affected
version: 14.0(2c), status: affected
version: 14.0(3d), status: affected
version: 14.0(3c), status: affected
version: 14.1(1i), status: affected
version: 14.1(1j), status: affected
version: 14.1(1k), status: affected
version: 14.1(1l), status: affected
version: 14.1(2g), status: affected
version: 14.1(2m), status: affected
version: 14.1(2o), status: affected
version: 14.1(2s), status: affected
version: 14.1(2u), status: affected
version: 14.1(2w), status: affected
version: 14.1(2x), status: affected
version: 14.2(1i), status: affected
version: 14.2(1j), status: affected
version: 14.2(1l), status: affected
version: 14.2(2e), status: affected
version: 14.2(2f), status: affected
version: 14.2(2g), status: affected
version: 14.2(3j), status: affected
version: 14.2(3l), status: affected
version: 14.2(3n), status: affected
version: 14.2(3q), status: affected
version: 14.2(4i), status: affected
version: 14.2(4k), status: affected
version: 14.2(4o), status: affected
version: 14.2(4p), status: affected
version: 14.2(5k), status: affected
version: 14.2(5l), status: affected
version: 14.2(5n), status: affected
version: 14.2(6d), status: affected
version: 14.2(6g), status: affected
version: 14.2(6h), status: affected
version: 14.2(6l), status: affected
version: 14.2(7f), status: affected
version: 14.2(7l), status: affected
version: 14.2(6o), status: affected
version: 14.2(7q), status: affected
version: 14.2(7r), status: affected
version: 14.2(7s), status: affected
version: 14.2(7t), status: affected
version: 14.2(7u), status: affected
version: 14.2(7v), status: affected
version: 14.2(7w), status: affected
version: 15.0(1k), status: affected
version: 15.0(1l), status: affected
version: 15.0(2e), status: affected
version: 15.0(2h), status: affected
version: 15.1(1h), status: affected
version: 15.1(2e), status: affected
version: 15.1(3e), status: affected
version: 15.1(4c), status: affected
version: 15.2(1g), status: affected
version: 15.2(2e), status: affected
version: 15.2(2f), status: affected
version: 15.2(2g), status: affected
version: 15.2(2h), status: affected
version: 15.2(3e), status: affected
version: 15.2(3f), status: affected
version: 15.2(3g), status: affected
version: 15.2(4d), status: affected
version: 15.2(4e), status: affected
version: 15.2(5c), status: affected
version: 15.2(5d), status: affected
version: 15.2(5e), status: affected
version: 15.2(4f), status: affected
version: 15.2(6e), status: affected
version: 15.2(6g), status: affected
version: 15.2(7f), status: affected
version: 15.2(7g), status: affected
version: 15.2(8d), status: affected
version: 15.2(8e), status: affected
version: 15.2(8f), status: affected
version: 15.2(8g), status: affected
version: 15.2(8h), status: affected
version: 16.0(1g), status: affected
version: 16.0(1j), status: affected
version: 16.0(2h), status: affected
version: 16.0(2j), status: affected
version: 16.0(3d), status: affected
version: 16.0(3e), status: affected
version: 15.3(1d), status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
baseScore: 7.4
baseSeverity: HIGH
attackVector: NETWORK
attackComplexity: HIGH
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: NONE
]
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.