⚠ Reference material — not professional advice. Test in staging, back up first, verify against your specific version. Use your own judgment for your environment.
● High · CVSS 8.7 ⚠ ACTIVELY EXPLOITED — CISA KEV

How to Fix CVE-2024-3393: Denial of Service in Cloud NGFW

Other vulnerabilities in the same area that are worth patching alongside this one:

*By Sai Kiran Pandrala*

⚡ At a glance
SeverityCVSS 8.7 - High
Actively exploited?Yes, listed in CISA KEV (added 2024-12-30)
Affected11.2.0 < 11.2.3, 11.1.0 < 11.1.2-h16, 10.2.8 < 10.2.8-h19, 10.1.14 < 10.1.14-h8, 11.2.0 < 11.2.3
Fixed inAll, 10.2.0
Type (CWE)CWE-754: Improper Check for Unusual or Exceptional Conditions
Patch immediately. CISA's KEV listing means active exploitation is confirmed. Federal agencies must remediate by 2025-01-20.

What is CVE-2024-3393?

CVE-2024-3393 is a denial of service flaw in Cloud NGFW. A crafted request triggers a code path that crashes or hangs the service, taking the product offline for legitimate users. Vendor 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.

Why this CVE matters

Denial-of-service flaws in a network gateway or firewall have an outsize operational impact. A single packet that reboots an inline device takes down everything behind it, which is why even non-RCE bugs on these products warrant priority patching.

For deployments of Cloud NGFW that have been exposed to the public internet during the disclosure window, the operating assumption should be that scanning has already happened. Confirmed in-the-wild exploitation makes that assumption mandatory, not cautious. Patching closes the door; log review and credential rotation close out the rest of the response.

Am I affected?

You are affected if your installation matches any of these version ranges:

Check your installed version against the list above. If you cannot determine the version, treat the system as affected and follow the upgrade path below.

On PAN-OS, run show system info | match sw-version from the CLI, or read the Dashboard widget in the GUI.

How to fix CVE-2024-3393

  1. Read the vendor advisory in full: https://security.paloaltonetworks.com/CVE-2024-3393
  2. Upgrade Cloud NGFW to All, 10.2.0 or a later version listed in the vendor advisory.
  3. Back up the configuration (and database, where applicable) before upgrading.
  4. Apply the patch in a maintenance window. For HA pairs, upgrade the standby node first, fail over, then upgrade the former primary.
  5. Restart the affected service so the patched binary loads, then verify the new version (see verification section).

Upgrade PAN-OS to the patched release


# Target PAN-OS build All.
show system info | match sw-version

request system software download version All
request system software install version All
request restart system

# Post-reboot verification
show system info | match sw-version

Verify the fix landed


# 1. Confirm the running version matches the fixed-in version from the advisory:
#    https://security.paloaltonetworks.com/CVE-2024-3393
#    Use the platform-specific version probe above.

# 2. Re-scan with your vulnerability scanner (Nessus, Qualys, Tenable, OpenVAS).
#    The scanner should no longer flag CVE-2024-3393 on the patched target.

# 3. Inspect recent service / kernel logs for crash loops or rollback events.
journalctl -u <service> --since "10 minutes ago"
dmesg --since "10 minutes ago"

If you cannot patch immediately

Front the service with rate limiting and drop malformed packets at a load balancer or IPS. Patch to remove the underlying crash condition.

How to verify the fix worked

If your installation was internet-reachable during the disclosure window, treat log review as part of the remediation rather than an optional follow-up. Look for repeated service restarts, crash logs from the affected daemon, and core files generated around the time of any anomalous traffic. A memory-corruption flaw used for exploitation often leaves a trail of failed attempts before the successful one. Because Cloud NGFW sits on CISA's Known Exploited Vulnerabilities catalog for this CVE, defenders should also pull the IOC list from the vendor advisory and from CISA's analysis if one was published.

Frequently asked questions

Is CVE-2024-3393 being exploited in the wild?

Yes. CISA added CVE-2024-3393 to the Known Exploited Vulnerabilities catalog, which means active exploitation has been confirmed by federal observation or credible vendor reporting.

Will a WAF or IDS rule fully mitigate CVE-2024-3393?

No. Network-layer filters can reduce noise and slow opportunistic scanners, but they will not stop a determined attacker. The vendor patch is the only durable fix.

How long should I plan for the upgrade?

Typical vendor-documented upgrade windows for Cloud NGFW run from a few minutes to under an hour depending on cluster size. Test in a staging environment first and follow the vendor's documented HA upgrade order.

References

*This guide was assembled from the official vendor advisory, the NVD record, and the CISA KEV catalog entry on 2026-05-25. Always confirm against the vendor advisory before applying changes in production.*