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

> An unauthenticated attacker can reboot a Palo Alto Networks firewall by sending a malicious packet, causing a denial of service.

- **Severity:** High 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`)
- **Exploited in the wild:** Yes, since 30 Dec 2024 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Dec 2024
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-gm94-vr86-wgqv

## What is CVE-2024-3393?

CVE-2024-3393 is a high-severity denial of service vulnerability in Paloaltonetworks Pan-Os, published on 27 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-754 (Improper Check for Unusual or Exceptional Conditions)

## Which versions are affected by CVE-2024-3393?

It affects 2 products.


Products: Paloaltonetworks Pan-Os, Paloaltonetworks Prisma Access.

## How do I fix CVE-2024-3393?

No fix has been published for CVE-2024-3393 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 20 Jan 2025.

## Is CVE-2024-3393 being exploited?

Yes. Attackers have exploited CVE-2024-3393 in the wild since at least 30 Dec 2024.

## Other vulnerabilities in Paloaltonetworks Pan-Os

- [CVE-2024-3400](https://insights.sbomify.com/CVE-2024-3400/): Palo Alto Networks PAN-OS Command Injection (critical 10.0, exploited in the wild)
- [CVE-2020-2021](https://insights.sbomify.com/CVE-2020-2021/): Palo Alto Networks PAN-OS Authentication Bypass (critical 10.0, exploited in the wild)
- [CVE-2017-15944](https://insights.sbomify.com/CVE-2017-15944/): Palo Alto Networks PAN-OS Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2026-0300](https://insights.sbomify.com/CVE-2026-0300/): Palo Alto Networks PAN-OS Out-of-bounds Write (critical 9.3, exploited in the wild)
- [CVE-2024-0012](https://insights.sbomify.com/CVE-2024-0012/): Palo Alto Networks PAN-OS Management Interface Authentication Bypass (critical 9.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-3393 and fix it if it is affected.

What it is: CVE-2024-3393 is a high-severity denial of service vulnerability in Paloaltonetworks Pan-Os, published on 27 Dec 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2024-3393 in the wild since at least 30 Dec 2024.

Affected product: Paloaltonetworks Pan-Os. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-3393/ (Markdown: https://insights.sbomify.com/CVE-2024-3393/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-3393
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-3393
- OSV: https://osv.dev/vulnerability/CVE-2024-3393

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-3393/
Summaries are generated and may contain mistakes; the official description above is the record.