CVE-2023-20185: high-severity vulnerability in Cisco NX-OS System Software in ACI Mode
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.4epss 0.3%
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
Cisco · Cisco NX-OS System Software in ACI ModeRelated CVEs — Cisco NX-OS System Software in ACI Mode
In the same product, most dangerous first.
CVE-2026-76455CRITICALCisco NX-OS Software Security Hardening Release: October 2026 - Improper Access Control VulnerabilitiesEPSS 3.6%CVE-2025-20292MEDIUMCisco NXOS Software Command Injection VulnerabilityEPSS 3.2%CVE-2021-1586HIGHCisco Nexus 9000 Series Fabric Switches ACI Mode Multi-Pod and Multi-Site TCP Denial of Service VulnerabilityEPSS 2.5%CVE-2021-1230HIGHCisco Nexus 9000 Series Fabric Switches ACI Mode BGP Route Installation Denial of Service VulnerabilityEPSS 1.5%CVE-2021-1523HIGHCisco Nexus 9000 Series Fabric Switches ACI Mode Queue Wedge Denial of Service VulnerabilityEPSS 1.3%CVE-2021-1584MEDIUMCisco Nexus 9000 Series Fabric Switches ACI Mode Privilege Escalation VulnerabilityEPSS 0.4%