Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability
Palo Alto Networks — Cloud NGFW
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.
8.7
26.6%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality (Vulnerable System)
- None
- Integrity (Vulnerable System)
- None
- Availability (Vulnerable System)
- High
- Confidentiality (Subsequent System)
- None
- Integrity (Subsequent System)
- None
- Availability (Subsequent System)
- Low
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/V:C/RE:M/U:Amber
- Published
- Dec 27, 2024
- Modified
- Oct 21, 2025
- Added to KEV
- Dec 30, 2024
- Federal patch due
- Jan 20, 2025
CISA required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2024-3393, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2024-3393 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is 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.
How severe is CVE-2024-3393?
CVE-2024-3393 has a CVSS base score of 8.7 out of 10 (CVSS 4.0).
Is CVE-2024-3393 actively exploited in the wild?
Yes. CVE-2024-3393 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Dec 30, 2024, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2024-3393?
26.6% - meaning FIRST.org's EPSS model estimates a 26.6% probability this vulnerability will be exploited in the wild within 30 days (98% percentile among all scored CVEs).
What type of vulnerability is CVE-2024-3393?
CVE-2024-3393 is classified under CWE-754 (CWE-754 Improper Check for Unusual or Exceptional Conditions).
Cross-checked against
Impactr finds and proves whether CVE-2024-3393 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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