Exploited CVEs / Palo Alto Networks / CVE-2024-3393
CVE-2024-3393
Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2025-01-20 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Palo Alto Networks Security Advisories, linked below.
Actively exploited Palo Alto Networks PAN-OS vulnerability, High severity, CVSS 7.5. Added to the CISA KEV catalog 2024-12-30.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2024-3393
No code execution here, but a single malicious DNS packet can remotely reboot a Palo Alto Networks firewall through a flaw in the DNS Security feature's packet parsing, and repeated packets keep it down. For organizations that depend on PAN-OS at the perimeter, that is a denial of service against the security boundary itself, exploitable by an unauthenticated attacker. CISA confirmed active exploitation on 2024-12-30, and the EPSS score stands at 27%.
Do this: Apply the PAN-OS fix on firewalls with DNS Security enabled before an outage forces the schedule for you.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2024-3393
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2024-3393
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: 2025-01-20 (past due).
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2024-3393
The authoritative fix and affected-version list are published by the vendor. Find the PAN-OS advisory on Palo Alto Networks Security Advisories.
Common questions about CVE-2024-3393
Is CVE-2024-3393 actively exploited?
Yes. CVE-2024-3393 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2024-12-30, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 27%.
What is the CISA deadline and required action for CVE-2024-3393?
CISA set the federal (BOD 22-01) remediation due date at 2025-01-20, 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-2024-3393?
The authoritative fix is in the vendor advisory: see Palo Alto Networks Security Advisories for the patched PAN-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-2024-3393?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2024-3393'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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Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
