A vulnerability in the Cisco Fabric Services component of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a buffer overflow, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient validation of Cisco Fabric Services packets. An attacker could exploit this vulnerability by sending a crafted Cisco Fabric Services packet to an affected device. A successful exploit could allow the attacker to cause a buffer overflow, resulting in process crashes and a DoS condition on the device. MDS 9000 Series Multilayer Switches are affected running software versions prior to 6.2(25), 8.1(1b), 8.3(1). Nexus 3000 Series Switches are affected running software versions prior to 7.0(3)I4(9) and 7.0(3)I7(4). Nexus 3500 Platform Switches are affected running software versions prior to 6.0(2)A8(10) and 7.0(3)I7(4). Nexus 3600 Platform Switches are affected running software versions prior to 7.0(3)F3(5) Nexus 7000 and 7700 Series Switches are affected running software versions prior to 6.2(22) and 8.2(3). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected running software versions prior to 7.0(3)I4(9) and 7.0(3)I7(4). Nexus 9500 R-Series Line Cards and Fabric Modules are affected running software versions prior to 7.0(3)F3(5). UCS 6200, 6300, and 6400 Fabric Interconnects are affected running software versions prior to 3.2(3j) and 4.0(2a).
| Software | From | Fixed in |
|---|---|---|
| cisco / nx-os | 8.2 | 8.3\(1\) |
| cisco / nx-os | 7.0\(3\) | 7.0\(3\)i7\(4\) |
| cisco / nx-os | 7.0\(3\)i5 | 7.0\(3\)i7\(4\) |
| cisco / nx-os | 7.0\(3\)f3 | 7.0\(3\)f3\(3c\) |
| cisco / nx-os | 7.2 | 8.2\(3\) |
| cisco / nx-os | 7.0\(3\)f1 | 7.0\(3\)f3\(3c\) |
| cisco / nx-os | 7.3 | 8.1\(1b\) |
| cisco / nx-os | 5.2 | 6.2\(25\) |
| cisco / nx-os | 7.0\(3\)i4 | 7.0\(3\)i4\(9\) |
| cisco / nx-os | 6.2 | 6.2\(22\) |
| cisco / nx-os | - | 6.2\(22\) |
| cisco / nx-os | - | 7.0\(3\)i4\(9\) |
| cisco / nx-os | 6.0\(2\)a8 | 6.0\(2\)a8\(10\) |
| cisco / nx-os | - | 6.0\(2\)a8.x |
| cisco / nx-os | - | 7.0\(3\)i4.x |
| cisco / nx-os | 4.0 | 4.0\(2a\) |
| cisco / nx-os | - | 3.2\(3j\) |
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.