Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2024-20267 — cisco / nx-os

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

A vulnerability with the handling of MPLS traffic for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause the netstack process to unexpectedly restart, which could cause the device to stop processing network traffic or to reload.

This vulnerability is due to lack of proper error checking when processing an ingress MPLS frame. An attacker could exploit this vulnerability by sending a crafted IPv6 packet that is encapsulated within an MPLS frame to an MPLS-enabled interface of the targeted device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition.

Note: The IPv6 packet can be generated multiple hops away from the targeted device and then encapsulated within MPLS. The DoS condition may occur when the NX-OS device processes the packet.

  • Published: Feb 29, 2024
  • Updated: Nov 16, 2025
  • CVE: CVE-2024-20267
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 8.6
  • AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CWEs:

Software From Fixed in
cisco / nx-os 6.0(2)u5(1) 6.0(2)u5(1).x
cisco / nx-os 6.0(2)u6(7) 6.0(2)u6(7).x
cisco / nx-os 6.2(2a) 6.2(2a).x
cisco / nx-os 7.1(1)n1(1) 7.1(1)n1(1).x
cisco / nx-os 7.3(0)n1(1) 7.3(0)n1(1).x
cisco / nx-os 6.0(2)a6(6) 6.0(2)a6(6).x
cisco / nx-os 6.2(12) 6.2(12).x
cisco / nx-os 6.0(2)a6(2) 6.0(2)a6(2).x
cisco / nx-os 7.1(0)n1(1b) 7.1(0)n1(1b).x
cisco / nx-os 6.2(6b) 6.2(6b).x
cisco / nx-os 7.1(3)n1(1) 7.1(3)n1(1).x
cisco / nx-os 6.0(2)u3(2) 6.0(2)u3(2).x
cisco / nx-os 6.0(2)u2(1) 6.0(2)u2(1).x
cisco / nx-os 6.0(2)u6(1) 6.0(2)u6(1).x
cisco / nx-os 6.0(2)u2(2) 6.0(2)u2(2).x
cisco / nx-os 6.0(2)u3(1) 6.0(2)u3(1).x
cisco / nx-os 6.0(2)a6(7) 6.0(2)a6(7).x
cisco / nx-os 7.1(2)n1(1) 7.1(2)n1(1).x
cisco / nx-os 6.0(2)u5(3) 6.0(2)u5(3).x
cisco / nx-os 7.2(1)d1(1) 7.2(1)d1(1).x
cisco / nx-os 6.0(2)a7(2) 6.0(2)a7(2).x
cisco / nx-os 6.0(2)u2(4) 6.0(2)u2(4).x
cisco / nx-os 6.0(2)a6(8) 6.0(2)a6(8).x
cisco / nx-os 6.2(8b) 6.2(8b).x
cisco / nx-os 6.0(2)u4(1) 6.0(2)u4(1).x
cisco / nx-os 7.1(4)n1(1) 7.1(4)n1(1).x
cisco / nx-os 6.2(10) 6.2(10).x
cisco / nx-os 6.0(2)a6(3) 6.0(2)a6(3).x
cisco / nx-os 6.0(2)u3(3) 6.0(2)u3(3).x
cisco / nx-os 6.0(2)u6(6) 6.0(2)u6(6).x
cisco / nx-os 7.1(0)n1(1a) 7.1(0)n1(1a).x
cisco / nx-os 6.0(2)u2(3) 6.0(2)u2(3).x
cisco / nx-os 6.2(8a) 6.2(8a).x
cisco / nx-os 6.0(2)u6(3) 6.0(2)u6(3).x
cisco / nx-os 6.0(2)a6(1) 6.0(2)a6(1).x
cisco / nx-os 6.0(2)u3(5) 6.0(2)u3(5).x
cisco / nx-os 7.1(3)n1(2) 7.1(3)n1(2).x
cisco / nx-os 6.0(2)a6(5) 6.0(2)a6(5).x
cisco / nx-os 6.0(2)u5(2) 6.0(2)u5(2).x
cisco / nx-os 6.2(2) 6.2(2).x
cisco / nx-os 6.0(2)u6(8) 6.0(2)u6(8).x
cisco / nx-os 6.0(2)u5(4) 6.0(2)u5(4).x
cisco / nx-os 6.0(2)a7(1) 6.0(2)a7(1).x
cisco / nx-os 6.0(2)u3(4) 6.0(2)u3(4).x
cisco / nx-os 6.0(2)u4(3) 6.0(2)u4(3).x
cisco / nx-os 6.0(2)u6(2) 6.0(2)u6(2).x
cisco / nx-os 6.0(2)a6(4) 6.0(2)a6(4).x
cisco / nx-os 6.0(2)u4(2) 6.0(2)u4(2).x
cisco / nx-os 6.0(2)u2(5) 6.0(2)u2(5).x
cisco / nx-os 6.0(2)a8(2) 6.0(2)a8(2).x
cisco / nx-os 6.2(6) 6.2(6).x
cisco / nx-os 6.0(2)a7(2a) 6.0(2)a7(2a).x
cisco / nx-os 6.0(2)u6(5) 6.0(2)u6(5).x
cisco / nx-os 6.2(8) 6.2(8).x
cisco / nx-os 6.0(2)u2(6) 6.0(2)u2(6).x
cisco / nx-os 6.0(2)u6(4) 6.0(2)u6(4).x
cisco / nx-os 7.0(3)i3(1) 7.0(3)i3(1).x
cisco / nx-os 7.0(3)i4(6) 7.0(3)i4(6).x
cisco / nx-os 6.0(2)a8(3) 6.0(2)a8(3).x
cisco / nx-os 7.0(3)i7(1) 7.0(3)i7(1).x
cisco / nx-os 7.0(3)i5(2) 7.0(3)i5(2).x
cisco / nx-os 7.0(3)i6(1) 7.0(3)i6(1).x
cisco / nx-os 7.2(2)d1(1) 7.2(2)d1(1).x
cisco / nx-os 7.2(2)d1(2) 7.2(2)d1(2).x
cisco / nx-os 7.0(3)i4(7) 7.0(3)i4(7).x
cisco / nx-os 6.0(2)a8(7) 6.0(2)a8(7).x
cisco / nx-os 7.0(3)i7(2) 7.0(3)i7(2).x
cisco / nx-os 7.0(3)i4(8) 7.0(3)i4(8).x
cisco / nx-os 6.0(2)a8(9) 6.0(2)a8(9).x
cisco / nx-os 7.0(3)i6(2) 7.0(3)i6(2).x
cisco / nx-os 7.0(3)i7(3) 7.0(3)i7(3).x
cisco / nx-os 9.2(2) 9.2(2).x
cisco / nx-os 7.0(3)i5(1) 7.0(3)i5(1).x
cisco / nx-os 9.2(1) 9.2(1).x
cisco / nx-os 7.0(3)i7(5) 7.0(3)i7(5).x
cisco / nx-os 7.0(3)f3(3) 7.0(3)f3(3).x
cisco / nx-os 9.3(1) 9.3(1).x
cisco / nx-os 9.2(3) 9.2(3).x
cisco / nx-os 6.2(24) 6.2(24).x
cisco / nx-os 7.3(0)d1(1) 7.3(0)d1(1).x
cisco / nx-os 7.1(5)n1(1) 7.1(5)n1(1).x
cisco / nx-os 7.1(5)n1(1b) 7.1(5)n1(1b).x
cisco / nx-os 7.1(0)n1(1) 7.1(0)n1(1).x
cisco / nx-os 6.0(2)a4(1) 6.0(2)a4(1).x
cisco / nx-os 6.0(2)a4(2) 6.0(2)a4(2).x
cisco / nx-os 6.0(2)a4(3) 6.0(2)a4(3).x
cisco / nx-os 6.0(2)a4(4) 6.0(2)a4(4).x
cisco / nx-os 6.0(2)a4(5) 6.0(2)a4(5).x
cisco / nx-os 6.0(2)a4(6) 6.0(2)a4(6).x
cisco / nx-os 6.0(2)a6(5a) 6.0(2)a6(5a).x
cisco / nx-os 6.0(2)a6(5b) 6.0(2)a6(5b).x
cisco / nx-os 6.0(2)a7(1a) 6.0(2)a7(1a).x
cisco / nx-os 6.0(2)a8(1) 6.0(2)a8(1).x
cisco / nx-os 6.0(2)a8(10) 6.0(2)a8(10).x
cisco / nx-os 6.0(2)a8(10a) 6.0(2)a8(10a).x
cisco / nx-os 6.0(2)a8(11) 6.0(2)a8(11).x
cisco / nx-os 6.0(2)a8(11a) 6.0(2)a8(11a).x
cisco / nx-os 6.0(2)a8(11b) 6.0(2)a8(11b).x
cisco / nx-os 6.0(2)a8(4) 6.0(2)a8(4).x
cisco / nx-os 6.0(2)a8(4a) 6.0(2)a8(4a).x
cisco / nx-os 6.0(2)a8(5) 6.0(2)a8(5).x
cisco / nx-os 6.0(2)a8(6) 6.0(2)a8(6).x
cisco / nx-os 6.0(2)a8(7b) 6.0(2)a8(7b).x
cisco / nx-os 6.0(2)u4(4) 6.0(2)u4(4).x
cisco / nx-os 6.0(2)u6(10) 6.0(2)u6(10).x
cisco / nx-os 6.0(2)u6(1a) 6.0(2)u6(1a).x
cisco / nx-os 6.0(2)u6(2a) 6.0(2)u6(2a).x
cisco / nx-os 6.0(2)u6(3a) 6.0(2)u6(3a).x
cisco / nx-os 6.0(2)u6(4a) 6.0(2)u6(4a).x
cisco / nx-os 6.0(2)u6(5a) 6.0(2)u6(5a).x
cisco / nx-os 6.0(2)u6(5b) 6.0(2)u6(5b).x
cisco / nx-os 6.0(2)u6(5c) 6.0(2)u6(5c).x
cisco / nx-os 6.0(2)u6(9) 6.0(2)u6(9).x
cisco / nx-os 7.0(3)f3(1) 7.0(3)f3(1).x
cisco / nx-os 7.0(3)f3(2) 7.0(3)f3(2).x
cisco / nx-os 7.0(3)f3(4) 7.0(3)f3(4).x
cisco / nx-os 7.0(3)i2(2) 7.0(3)i2(2).x
cisco / nx-os 7.0(3)i2(2a) 7.0(3)i2(2a).x
cisco / nx-os 7.0(3)i4(8b) 7.0(3)i4(8b).x
cisco / nx-os 7.0(3)i7(5a) 7.0(3)i7(5a).x
cisco / nx-os 7.0(3)i7(6) 7.0(3)i7(6).x
cisco / nx-os 7.0(3)i7(7) 7.0(3)i7(7).x
cisco / nx-os 6.0(2)a6(1a) 6.0(2)a6(1a).x
cisco / nx-os 6.0(2)a6(2a) 6.0(2)a6(2a).x
cisco / nx-os 6.0(2)a6(3a) 6.0(2)a6(3a).x
cisco / nx-os 6.0(2)a6(4a) 6.0(2)a6(4a).x
cisco / nx-os 6.0(2)a8(7a) 6.0(2)a8(7a).x
cisco / nx-os 6.0(2)a8(8) 6.0(2)a8(8).x
cisco / nx-os 7.0(3)f3(3a) 7.0(3)f3(3a).x
cisco / nx-os 7.0(3)f3(3c) 7.0(3)f3(3c).x
cisco / nx-os 7.0(3)f3(5) 7.0(3)f3(5).x
cisco / nx-os 7.0(3)i2(1) 7.0(3)i2(1).x
cisco / nx-os 7.0(3)i4(4) 7.0(3)i4(4).x
cisco / nx-os 7.0(3)i4(5) 7.0(3)i4(5).x
cisco / nx-os 7.0(3)i4(9) 7.0(3)i4(9).x
cisco / nx-os 7.0(3)i7(4) 7.0(3)i7(4).x
cisco / nx-os 7.0(3)i2(1a) 7.0(3)i2(1a).x
cisco / nx-os 7.0(3)i2(2b) 7.0(3)i2(2b).x
cisco / nx-os 7.0(3)i2(2c) 7.0(3)i2(2c).x
cisco / nx-os 7.0(3)i2(2d) 7.0(3)i2(2d).x
cisco / nx-os 7.0(3)i2(2e) 7.0(3)i2(2e).x
cisco / nx-os 7.0(3)i2(3) 7.0(3)i2(3).x
cisco / nx-os 7.0(3)i2(4) 7.0(3)i2(4).x
cisco / nx-os 7.0(3)i2(5) 7.0(3)i2(5).x
cisco / nx-os 7.0(3)i4(1) 7.0(3)i4(1).x
cisco / nx-os 7.0(3)i4(2) 7.0(3)i4(2).x
cisco / nx-os 7.0(3)i4(3) 7.0(3)i4(3).x
cisco / nx-os 7.0(3)i4(8a) 7.0(3)i4(8a).x
cisco / nx-os 7.0(3)i4(8z) 7.0(3)i4(8z).x
cisco / nx-os 6.0(2)u3(9) 6.0(2)u3(9).x
cisco / nx-os 6.0(2)u3(8) 6.0(2)u3(8).x
cisco / nx-os 6.0(2)u3(7) 6.0(2)u3(7).x
cisco / nx-os 6.0(2)u3(6) 6.0(2)u3(6).x
cisco / nx-os 6.0(2)a3(4) 6.0(2)a3(4).x
cisco / nx-os 6.0(2)a3(2) 6.0(2)a3(2).x
cisco / nx-os 6.0(2)a3(1) 6.0(2)a3(1).x
cisco / nx-os 7.3(0)dx(1) 7.3(0)dx(1).x
cisco / nx-os 7.2(0)d1(1) 7.2(0)d1(1).x
cisco / nx-os 6.2(6a) 6.2(6a).x
cisco / nx-os 6.2(22) 6.2(22).x
cisco / nx-os 6.2(20a) 6.2(20a).x
cisco / nx-os 6.2(20) 6.2(20).x
cisco / nx-os 6.2(18) 6.2(18).x
cisco / nx-os 6.2(16) 6.2(16).x
cisco / nx-os 6.2(14) 6.2(14).x
cisco / nx-os 9.3(5) 9.3(5).x
cisco / nx-os 7.0(3)i7(9) 7.0(3)i7(9).x
cisco / nx-os 9.3(6) 9.3(6).x
cisco / nx-os 9.3(7) 9.3(7).x
cisco / nx-os 9.3(4) 9.3(4).x
cisco / nx-os 9.3(3) 9.3(3).x
cisco / nx-os 7.0(3)i7(8) 7.0(3)i7(8).x
cisco / nx-os 7.0(3)f2(1) 7.0(3)f2(1).x
cisco / nx-os 7.0(3)f1(1) 7.0(3)f1(1).x
cisco / nx-os 7.0(3)f2(2) 7.0(3)f2(2).x
cisco / nx-os 9.3(2) 9.3(2).x
cisco / nx-os 9.2(2t) 9.2(2t).x
cisco / nx-os 9.2(2v) 9.2(2v).x
cisco / nx-os 9.2(4) 9.2(4).x
cisco / nx-os 9.3(7a) 9.3(7a).x
cisco / nx-os 9.3(8) 9.3(8).x
cisco / nx-os 9.3(9) 9.3(9).x
cisco / nx-os 9.3(10) 9.3(10).x
cisco / nx-os 9.3(11) 9.3(11).x
cisco / nx-os 10.1(1) 10.1(1).x
cisco / nx-os 10.1(2) 10.1(2).x
cisco / nx-os 10.1(2t) 10.1(2t).x
cisco / nx-os 10.2(1) 10.2(1).x
cisco / nx-os 10.2(1q) 10.2(1q).x
cisco / nx-os 10.2(2) 10.2(2).x
cisco / nx-os 10.2(3) 10.2(3).x
cisco / nx-os 10.2(3t) 10.2(3t).x
cisco / nx-os 10.2(4) 10.2(4).x
cisco / nx-os 10.2(5) 10.2(5).x
cisco / nx-os 10.3(1) 10.3(1).x
cisco / nx-os 10.3(2) 10.3(2).x
cisco / nx-os 6.2(24a) 6.2(24a).x
cisco / nx-os 7.0(3)i7(10) 7.0(3)i7(10).x
cisco / nx-os 9.3(12) 9.3(12).x
cisco / nx-os 10.2(3v) 10.2(3v).x
cisco / nx-os 10.2(6) 10.2(6).x
cisco / nx-os 10.3(3) 10.3(3).x
cisco / nx-os 10.3(99w) 10.3(99w).x
cisco / nx-os 10.3(99x) 10.3(99x).x
cisco / nx-os 10.4(1) 10.4(1).x

Frequently Asked Questions

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.