# Palo Alto Networks PAN-OS Malicious DNS Packet · pwn.watch

> Palo Alto Networks PAN-OS contains a vulnerability in parsing and logging malicious DNS packets in the DNS Security feature that, when exploited, allows an unauthenticated attacker to remotely reboot the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode. Added to the CISA KEV catalog on 2024-12-30.

Page: https://pwn.watch/i/palo-alto-networks-pan-os-cve-2024-3393 · generated 2026-10-22T21:47:37.879Z

## Status
- Severity: high · status: closed · patch: patched
- Product: Palo Alto Networks PAN-OS
- Started: 2024-12-27 · closed: 2024-12-30
- CVEs: CVE-2024-3393
- Affected: See vendor advisory (versions are not listed in the KEV record)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/palo-alto-networks-pan-os-cve-2024-3393/feed.xml
- JSON Feed: https://pwn.watch/i/palo-alto-networks-pan-os-cve-2024-3393/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/palo-alto-networks-pan-os-cve-2024-3393.json
- This file: https://pwn.watch/i/palo-alto-networks-pan-os-cve-2024-3393/llms.txt

## Updates (newest first)
- 2024-12-30: CISA added CVE-2024-3393 to the KEV catalog (federal deadline 2025-01-20) (https://www.cisa.gov/known-exploited-vulnerabilities-catalog)
- 2024-12-27: CVE-2024-3393 published (https://nvd.nist.gov/vuln/detail/CVE-2024-3393)

## Fix brief
# Security brief: Palo Alto Networks PAN-OS Malicious DNS Packet

Source: https://pwn.watch/i/palo-alto-networks-pan-os-cve-2024-3393 · status: closed (closed Dec 30, 2024) · severity: high · updated Dec 30, 2024

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
Palo Alto Networks PAN-OS contains a vulnerability in parsing and logging malicious DNS packets in the DNS Security feature that, when exploited, allows an unauthenticated attacker to remotely reboot the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode. Added to the CISA KEV catalog on 2024-12-30.

Severity detail: CVSS 8.7 (v4.0, CNA), actively exploited (CISA KEV)

- Product: Palo Alto Networks PAN-OS
- CVE / advisory ids: CVE-2024-3393

## Affected versions
- See vendor advisory (versions are not listed in the KEV record)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- Dec 30, 2024: CISA added CVE-2024-3393 to the KEV catalog (federal deadline 2025-01-20)
- Dec 27, 2024: CVE-2024-3393 published

## Advisories
- [Palo Alto Networks advisory: CVE-2024-3393](https://security.paloaltonetworks.com/CVE-2024-3393) (Palo Alto Networks)
- [NVD: CVE-2024-3393](https://nvd.nist.gov/vuln/detail/CVE-2024-3393) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from the CISA KEV JSON feed (catalogVersion 2026.10.21); CVSS from the CVE record (cveawg.mitre.org). startedAt is the CVE publication date when it fell in 2024 before the KEV listing, else the KEV dateAdded; exploitation may have begun earlier. closedAt is the KEV listing date (a fix or mitigation was available then unless noted).

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Machine-readable: https://pwn.watch/i/palo-alto-networks-pan-os-cve-2024-3393.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.