What is CVE-2024-3393?

CVE-2024-3393 is a high-severity vulnerability in Palo Alto Networks Cloud Ngfw, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2024-12-27.

How severe is CVE-2024-3393?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2024-3393 known to be exploited?

Yes. CVE-2024-3393 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-12-30), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.

Vulnerability in Palo Alto Networks Cloud Ngfw

CVE-2024-3393

A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode.

Published 2024-12-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.291 (98.2th percentile), scored 2026-10-19.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.284 · newest: 0.291 · change: +0.007

Affected products

Palo Alto Networks Cloud Ngfw — versions All
Palo Alto Networks Pan-Os — versions 11.2.0, 11.1.0, 10.2.8
Paloaltonetworks Pan-Os — versions 10.1.14, 10.2.8, 10.2.9
Paloaltonetworks Prisma Access

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2024-12-30. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-01-20.

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Public proof-of-concept exploits

References

security.paloaltonetworks.com/CVE-2024-3393 (vendor-advisory, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2024-3393?: CVE-2024-3393 is a high-severity vulnerability in Palo Alto Networks Cloud Ngfw, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2024-12-27.
How severe is CVE-2024-3393?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2024-3393 known to be exploited?: Yes. CVE-2024-3393 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-12-30), indicating it is being actively exploited. 6 public proof-of-concept repositories are indexed.