A vulnerability in the fabric infrastructure VLAN connection establishment of Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) Mode could allow an unauthenticated, adjacent attacker to bypass security validations and connect an unauthorized server to the infrastructure VLAN. This vulnerability is due to insufficient security requirements during the Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure VLAN. An attacker could exploit this vulnerability by sending a crafted LLDP packet on the adjacent subnet to an affected device. A successful exploit could allow the attacker to connect an unauthorized server to the infrastructure VLAN, which is highly privileged. With a connection to the infrastructure VLAN, the attacker can make unauthorized connections to Cisco Application Policy Infrastructure Controller (APIC) services or join other host endpoints.
| Software | From | Fixed in |
|---|---|---|
| cisco / nx-os | 11.0(1b) | 11.0(1b).x |
| cisco / nx-os | 11.0(1c) | 11.0(1c).x |
| cisco / nx-os | 11.0(1d) | 11.0(1d).x |
| cisco / nx-os | 11.0(1e) | 11.0(1e).x |
| cisco / nx-os | 11.0(2j) | 11.0(2j).x |
| cisco / nx-os | 11.0(2m) | 11.0(2m).x |
| cisco / nx-os | 11.0(3f) | 11.0(3f).x |
| cisco / nx-os | 11.0(3i) | 11.0(3i).x |
| cisco / nx-os | 11.0(3k) | 11.0(3k).x |
| cisco / nx-os | 11.0(3n) | 11.0(3n).x |
| cisco / nx-os | 11.0(3o) | 11.0(3o).x |
| cisco / nx-os | 11.0(4g) | 11.0(4g).x |
| cisco / nx-os | 11.0(4h) | 11.0(4h).x |
| cisco / nx-os | 11.0(4o) | 11.0(4o).x |
| cisco / nx-os | 11.0(4q) | 11.0(4q).x |
| cisco / nx-os | 11.1(1j) | 11.1(1j).x |
| cisco / nx-os | 11.1(1o) | 11.1(1o).x |
| cisco / nx-os | 11.1(1r) | 11.1(1r).x |
| cisco / nx-os | 11.1(1s) | 11.1(1s).x |
| cisco / nx-os | 11.1(2h) | 11.1(2h).x |
| cisco / nx-os | 11.1(2i) | 11.1(2i).x |
| cisco / nx-os | 11.1(3f) | 11.1(3f).x |
| cisco / nx-os | 11.1(4e) | 11.1(4e).x |
| cisco / nx-os | 11.1(4f) | 11.1(4f).x |
| cisco / nx-os | 11.1(4g) | 11.1(4g).x |
| cisco / nx-os | 11.1(4i) | 11.1(4i).x |
| cisco / nx-os | 11.1(4l) | 11.1(4l).x |
| cisco / nx-os | 11.1(4m) | 11.1(4m).x |
| cisco / nx-os | 11.2(1i) | 11.2(1i).x |
| cisco / nx-os | 11.2(1k) | 11.2(1k).x |
| cisco / nx-os | 11.2(1m) | 11.2(1m).x |
| cisco / nx-os | 11.2(2g) | 11.2(2g).x |
| cisco / nx-os | 11.2(2h) | 11.2(2h).x |
| cisco / nx-os | 11.2(2i) | 11.2(2i).x |
| cisco / nx-os | 11.2(2j) | 11.2(2j).x |
| cisco / nx-os | 11.2(3c) | 11.2(3c).x |
| cisco / nx-os | 11.2(3e) | 11.2(3e).x |
| cisco / nx-os | 11.2(3h) | 11.2(3h).x |
| cisco / nx-os | 11.2(3m) | 11.2(3m).x |
| cisco / nx-os | 11.3(1g) | 11.3(1g).x |
| cisco / nx-os | 11.3(1h) | 11.3(1h).x |
| cisco / nx-os | 11.3(1i) | 11.3(1i).x |
| cisco / nx-os | 11.3(1j) | 11.3(1j).x |
| cisco / nx-os | 11.3(2f) | 11.3(2f).x |
| cisco / nx-os | 11.3(2h) | 11.3(2h).x |
| cisco / nx-os | 11.3(2i) | 11.3(2i).x |
| cisco / nx-os | 11.3(2j) | 11.3(2j).x |
| cisco / nx-os | 11.3(2k) | 11.3(2k).x |
| cisco / nx-os | 12.0(1m) | 12.0(1m).x |
| cisco / nx-os | 12.0(1n) | 12.0(1n).x |
| cisco / nx-os | 12.0(1o) | 12.0(1o).x |
| cisco / nx-os | 12.0(1p) | 12.0(1p).x |
| cisco / nx-os | 12.0(1q) | 12.0(1q).x |
| cisco / nx-os | 12.0(1r) | 12.0(1r).x |
| cisco / nx-os | 12.0(2f) | 12.0(2f).x |
| cisco / nx-os | 12.0(2g) | 12.0(2g).x |
| cisco / nx-os | 12.0(2h) | 12.0(2h).x |
| cisco / nx-os | 12.0(2l) | 12.0(2l).x |
| cisco / nx-os | 12.0(2m) | 12.0(2m).x |
| cisco / nx-os | 12.0(2n) | 12.0(2n).x |
| cisco / nx-os | 12.0(2o) | 12.0(2o).x |
| cisco / nx-os | 12.1(1h) | 12.1(1h).x |
| cisco / nx-os | 12.1(1i) | 12.1(1i).x |
| cisco / nx-os | 12.1(2e) | 12.1(2e).x |
| cisco / nx-os | 12.1(2g) | 12.1(2g).x |
| cisco / nx-os | 12.1(2k) | 12.1(2k).x |
| cisco / nx-os | 12.1(3g) | 12.1(3g).x |
| cisco / nx-os | 12.1(3h) | 12.1(3h).x |
| cisco / nx-os | 12.1(3j) | 12.1(3j).x |
| cisco / nx-os | 12.1(4a) | 12.1(4a).x |
| cisco / nx-os | 12.2(1k) | 12.2(1k).x |
| cisco / nx-os | 12.2(1n) | 12.2(1n).x |
| cisco / nx-os | 12.2(1o) | 12.2(1o).x |
| cisco / nx-os | 12.2(2e) | 12.2(2e).x |
| cisco / nx-os | 12.2(2f) | 12.2(2f).x |
| cisco / nx-os | 12.2(2i) | 12.2(2i).x |
| cisco / nx-os | 12.2(2j) | 12.2(2j).x |
| cisco / nx-os | 12.2(2k) | 12.2(2k).x |
| cisco / nx-os | 12.2(2q) | 12.2(2q).x |
| cisco / nx-os | 12.2(3j) | 12.2(3j).x |
| cisco / nx-os | 12.2(3p) | 12.2(3p).x |
| cisco / nx-os | 12.2(3r) | 12.2(3r).x |
| cisco / nx-os | 12.2(3s) | 12.2(3s).x |
| cisco / nx-os | 12.2(3t) | 12.2(3t).x |
| cisco / nx-os | 12.2(4f) | 12.2(4f).x |
| cisco / nx-os | 12.2(4p) | 12.2(4p).x |
| cisco / nx-os | 12.2(4q) | 12.2(4q).x |
| cisco / nx-os | 12.2(4r) | 12.2(4r).x |
| cisco / nx-os | 12.3(1e) | 12.3(1e).x |
| cisco / nx-os | 12.3(1f) | 12.3(1f).x |
| cisco / nx-os | 12.3(1i) | 12.3(1i).x |
| cisco / nx-os | 12.3(1l) | 12.3(1l).x |
| cisco / nx-os | 12.3(1o) | 12.3(1o).x |
| cisco / nx-os | 12.3(1p) | 12.3(1p).x |
| cisco / nx-os | 13.0(1k) | 13.0(1k).x |
| cisco / nx-os | 13.0(2h) | 13.0(2h).x |
| cisco / nx-os | 13.0(2k) | 13.0(2k).x |
| cisco / nx-os | 13.0(2n) | 13.0(2n).x |
| cisco / nx-os | 13.1(1i) | 13.1(1i).x |
| cisco / nx-os | 13.1(2m) | 13.1(2m).x |
| cisco / nx-os | 13.1(2o) | 13.1(2o).x |
| cisco / nx-os | 13.1(2p) | 13.1(2p).x |
| cisco / nx-os | 13.1(2q) | 13.1(2q).x |
| cisco / nx-os | 13.1(2s) | 13.1(2s).x |
| cisco / nx-os | 13.1(2t) | 13.1(2t).x |
| cisco / nx-os | 13.1(2u) | 13.1(2u).x |
| cisco / nx-os | 13.1(2v) | 13.1(2v).x |
| cisco / nx-os | 13.2(1l) | 13.2(1l).x |
| cisco / nx-os | 13.2(1m) | 13.2(1m).x |
| cisco / nx-os | 13.2(2l) | 13.2(2l).x |
| cisco / nx-os | 13.2(2o) | 13.2(2o).x |
| cisco / nx-os | 13.2(3i) | 13.2(3i).x |
| cisco / nx-os | 13.2(3j) | 13.2(3j).x |
| cisco / nx-os | 13.2(3n) | 13.2(3n).x |
| cisco / nx-os | 13.2(3o) | 13.2(3o).x |
| cisco / nx-os | 13.2(3r) | 13.2(3r).x |
| cisco / nx-os | 13.2(3s) | 13.2(3s).x |
| cisco / nx-os | 13.2(4d) | 13.2(4d).x |
| cisco / nx-os | 13.2(4e) | 13.2(4e).x |
| cisco / nx-os | 13.2(5d) | 13.2(5d).x |
| cisco / nx-os | 13.2(5e) | 13.2(5e).x |
| cisco / nx-os | 13.2(5f) | 13.2(5f).x |
| cisco / nx-os | 13.2(6i) | 13.2(6i).x |
| cisco / nx-os | 13.2(7f) | 13.2(7f).x |
| cisco / nx-os | 13.2(7k) | 13.2(7k).x |
| cisco / nx-os | 13.2(8d) | 13.2(8d).x |
| cisco / nx-os | 13.2(9b) | 13.2(9b).x |
| cisco / nx-os | 13.2(9f) | 13.2(9f).x |
| cisco / nx-os | 13.2(9h) | 13.2(9h).x |
| cisco / nx-os | 13.2(41d) | 13.2(41d).x |
| cisco / nx-os | 14.0(1h) | 14.0(1h).x |
| cisco / nx-os | 14.0(2c) | 14.0(2c).x |
| cisco / nx-os | 14.0(3c) | 14.0(3c).x |
| cisco / nx-os | 14.0(3d) | 14.0(3d).x |
| cisco / nx-os | 14.1(1i) | 14.1(1i).x |
| cisco / nx-os | 14.1(1j) | 14.1(1j).x |
| cisco / nx-os | 14.1(1k) | 14.1(1k).x |
| cisco / nx-os | 14.1(1l) | 14.1(1l).x |
| cisco / nx-os | 14.1(2g) | 14.1(2g).x |
| cisco / nx-os | 14.1(2m) | 14.1(2m).x |
| cisco / nx-os | 14.1(2o) | 14.1(2o).x |
| cisco / nx-os | 14.1(2s) | 14.1(2s).x |
| cisco / nx-os | 14.1(2u) | 14.1(2u).x |
| cisco / nx-os | 14.1(2w) | 14.1(2w).x |
| cisco / nx-os | 14.1(2x) | 14.1(2x).x |
| cisco / nx-os | 14.2(1i) | 14.2(1i).x |
| cisco / nx-os | 14.2(1j) | 14.2(1j).x |
| cisco / nx-os | 14.2(1l) | 14.2(1l).x |
| cisco / nx-os | 14.2(2e) | 14.2(2e).x |
| cisco / nx-os | 14.2(2f) | 14.2(2f).x |
| cisco / nx-os | 14.2(3j) | 14.2(3j).x |
| cisco / nx-os | 14.2(3l) | 14.2(3l).x |
| cisco / nx-os | 14.2(3n) | 14.2(3n).x |
| cisco / nx-os | 14.2(3q) | 14.2(3q).x |
| cisco / nx-os | 14.2(4i) | 14.2(4i).x |
| cisco / nx-os | 14.2(4k) | 14.2(4k).x |
| cisco / nx-os | 14.2(4o) | 14.2(4o).x |
| cisco / nx-os | 14.2(4p) | 14.2(4p).x |
| cisco / nx-os | 14.2(5k) | 14.2(5k).x |
| cisco / nx-os | 15.0(1k) | 15.0(1k).x |
| cisco / nx-os | 15.0(1l) | 15.0(1l).x |
| cisco / nx-os | 15.0(2h) | 15.0(2h).x |
A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.
Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.
Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.