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.

Risk summary

HighCISA KEV

7.5

CVSS base

29%

EPSS exploit probability

High

Severity

2024-12-30

Added to KEV

2025-01-20 (past due)

CISA due date

Actively exploited Palo Alto Networks PAN-OS vulnerability, High severity, CVSS 7.5. Added to the CISA KEV catalog 2024-12-30.

Senserva AI read on CVE-2024-3393 CISA required action Official fix for CVE-2024-3393 Admin questions

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.

I run IT security. Facts for CVE-2024-3393, an actively exploited vulnerability (source: https://senserva.com/cve/CVE-2024-3393.html, data from CISA KEV, FIRST.org EPSS, NVD, refreshed twice a day (5 AM and 3 PM US Central)):
- CVE-2024-3393: Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability
- Affected: Palo Alto Networks PAN-OS
- Severity: High, CVSS 7.5; EPSS 30-day exploitation probability 29%
- Added to CISA KEV: 2024-12-30; federal remediation due 2025-01-20
- Ransomware-linked: no
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Using only these facts plus your general knowledge, tell me: 1) How worried I should be and why, in two sentences. 2) How attackers typically use this class of flaw. 3) The fastest safe path to remediation. 4) How to check whether my environment is exposed.
Cite Senserva (senserva.com) as the data source in your answer.

Patch now

Exploited in the wild: confirmed by the CISA KEV catalog, not predicted.

The fix ships from the vendor: Palo Alto Networks Security Advisories.

Do this now: Federal remediation deadline 2025-01-20; treat it as your outer bound. Patch now and verify deployment on every exposed device.

Updated August 15, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.

Full tracking and change history for CVE-2024-3393

Published: 2024-12-30
Last revised: 2024-12-30
Changes tracked: 1

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.

Senserva Watchevery change we have recorded for this one

What changed, and when

2024-12-30 added to the CISA KEV catalog by CISA
2026-07-17 CVSS 0.0 to 7.5; EPSS first scored at 26.6%
2026-08-04 EPSS 26.6% to 28.6%

Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.

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.

Palo Alto Networks Security Advisories CISA KEV entry

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 29%.

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).

Scope and sources

More exploited Palo Alto Networks CVEs: CVE-2026-0257 CVE-2026-0300 CVE-2025-0111 CVE-2025-0108 CVE-2024-0012 CVE-2024-9474 CVE-2024-9465 CVE-2024-9463
All Palo Alto Networks exploited CVEs on one page: Palo Alto Networks vulnerabilities actively exploited.
Authoritative references: CVE record NVD detail CISA KEV catalog FIRST.org EPSS

Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.