Exploited CVEs / Cisco / CVE-2024-20399
CVE-2024-20399
Cisco NX-OS Command Injection Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2024-07-23 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Cisco Security Advisories (PSIRT), linked below.
Actively exploited Cisco NX-OS vulnerability, Medium severity, CVSS 6.7. Added to the CISA KEV catalog 2024-07-02.
Risk summary
Updated July 27, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2024-20399
Unusually for a KEV entry, this Cisco NX-OS bug needs an attacker who already has valid admin credentials on the switch CLI, which is exactly why its Medium Severity (CVSS 6.7) and 4 percent EPSS understate the risk: it was used in the wild to drop code as root on data center switches after credential theft. Command injection at the CLI gives full control of the underlying operating system, a foothold that survives most monitoring because few teams watch their Nexus switches closely.
Do this: Update NX-OS on your Nexus switches and rotate the network admin credentials, since exploitation implies the attacker already had valid logins.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2024-20399
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2024-20399
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2024-07-23 (past due).
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2024-20399
The authoritative fix and affected-version list are published by the vendor. Find the NX-OS advisory on Cisco Security Advisories (PSIRT).
Common questions about CVE-2024-20399
Is CVE-2024-20399 actively exploited?
Yes. CVE-2024-20399 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2024-07-02, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 4.3%.
What is the CISA deadline and required action for CVE-2024-20399?
CISA set the federal (BOD 22-01) remediation due date at 2024-07-23, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
What fixes CVE-2024-20399?
The authoritative fix is in the vendor advisory: see Cisco Security Advisories (PSIRT) for the patched NX-OS versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2024-20399?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2024-20399's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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