CVE intelligence and bounded remediation

CVE-2024-20321 — Cisco Nx-Os security vulnerability

High CVSS 8.6

A vulnerability in the External Border Gateway Protocol (eBGP) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because eBGP traffic is mapped to a shared hardware rate-limiter queue. An attacker could exploit this vulnerability by sending large amounts of network traffic with certain characteristics through an affected device. A successful exploit could allow the attacker to cause eBGP neighbor sessions to be dropped, leading to a DoS condition in the network.

Severity
High
CVSS
8.6 (3.1)
Published
2024-02-29
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-400, CWE-770

Affected products

  • cisco / nx-os / 7.0(3)f1(1)
  • cisco / nx-os / 7.0(3)f2(1)
  • cisco / nx-os / 7.0(3)f2(2)
  • cisco / nx-os / 7.0(3)f3(1)
  • cisco / nx-os / 7.0(3)f3(2)
  • cisco / nx-os / 7.0(3)f3(3)

Showing 6 representative product identities from 48 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Resource exhaustion and denial of service

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
  • Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
  • Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.

Remediate safely

  • Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
  • Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
  • Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.

Authoritative sources

Complete CVE record and remediation plan

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