---
title: "CVE-2024-3393: Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-3393/
description: "CVE-2024-3393 (Palo Alto Networks PAN-OS): Exploited in the wild (CISA KEV). A Denial of Service vulnerability in the DNS Security feature of Palo Alto…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-12-27
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-3393"
kev: true
cvss: 8.7
epss: 0.2912
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-3393: Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Palo Alto Networks PAN-OS. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-12-30, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-01-20 ; treat that as the outer limit, not the target.
- EPSS 29.1% , percentile 98: FIRST’s model estimates a 29.1% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- Palo Alto Networks Cloud NGFW: see advisory
- Palo Alto Networks PAN-OS: 11.2.0 < 11.2.3, 11.1.0 < 11.1.2-h16, 10.2.8 < 10.2.8-h19, 10.1.14 < 10.1.14-h8
- Palo Alto Networks PAN-OS: 11.2.0 < 11.2.3

## Severity

- palo_alto CVSS 4.0: 8.7 `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`
- palo_alto CVSS 4.0: 7.1 `CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:N/R:U/V:C/RE:M/U:Amber`

## Exploitation

- CISA KEV: added 2024-12-30; federal due date 2025-01-20. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 29.12% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [security.paloaltonetworks.com](https://security.paloaltonetworks.com/CVE-2024-3393)
- [CVE.org record CVE-2024-3393](https://www.cve.org/CVERecord?id=CVE-2024-3393)
- [NVD entry CVE-2024-3393](https://nvd.nist.gov/vuln/detail/CVE-2024-3393)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-3393)

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Source page: https://erroneo.us/security/cve/CVE-2024-3393/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt