The ACL implementation in Cisco NX-OS 5.0(2) and 5.0(3) before 5.0(3)N2(1) on Nexus 5000 series switches, and NX-OS before 5.0(3)U1(2a) on Nexus 3000 series switches, does not properly handle comments in conjunction with deny statements, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances by sending packets, aka Bug IDs CSCto09813 and CSCtr61490.
CVE-2011-2581 is a security vulnerability that . Impacting 3 products from cisco, from cisco, from cisco organizations running these solutions should prioritize assessment and patching.
Documented in 2011, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.
2011-09-14T16:05:23.603
2025-04-11T00:51:21.963
Deferred
CVSSv2: 5.0 (MEDIUM)
AV:N/AC:L/Au:N/C:P/I:N/A:N
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | cisco | nx-os | 5.0\(2\) | Yes |
| Application | cisco | nx-os | 5.0\(3\)n1\(1\) | Yes |
| Application | cisco | nx-os | 5.0\(3\)n1\(1a\) | Yes |
| Application | cisco | nx-os | 5.0\(3\)n1\(1b\) | Yes |
| Operating System | cisco | nx-os | 5.0\(3\) | Yes |
| Operating System | cisco | nx-os | 5.0\(3\)n1\(1c\) | Yes |
| Hardware | cisco | nexus_5000 | * | Yes |
| Operating System | cisco | nx-os | ≤ 5.0\(3\)u1\(2\) | Yes |
| Operating System | cisco | nx-os | 5.0\(3\)u1\(1a\) | Yes |
| Operating System | cisco | nx-os | 5.0\(3\)u1\(1b\) | Yes |
| Operating System | cisco | nx-os | 5.0\(3\)u1\(1d\) | Yes |
| Hardware | cisco | nexus_3000 | * | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.