CVE-2024-3393Known exploitationNetwork attack vector

Firewall reboot via malicious DNS packet

Published Dec 27, 2024 · Updated Oct 21, 2025

Denial of service in PAN-OS DNS Security allows remote attackers to reboot a firewall by sending a malicious packet through its data plane. Palo Alto Networks has not disclosed the packet structure or the exact exceptional condition that DNS Security mishandles. Exposure requires a DNS Security license and enabled DNS Security logging; repeated packets force maintenance mode and leave the firewall offline.

CVSS severity8.7
High
EPSS probability28.41%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in PAN-OS DNS Security allows remote attackers to reboot a firewall by sending a malicious packet through its data plane. Palo Alto Networks has not disclosed the packet structure or the exact exceptional condition that DNS Security mishandles. Exposure requires a DNS Security license and enabled DNS Security logging; repeated packets force maintenance mode and leave the firewall offline.

The record

CVE
CVE-2024-3393
Published
Dec 27, 2024
Updated
Oct 21, 2025
Vendor
Palo Alto Networks
Product
PAN-OS
Classifications
CWE-754, CAPEC-540, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2024Exploitation reportedCISA Known Exploited Vulnerabilities Catalog entry
  3. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.14 <10.1.14-h8 changes=[{"at":"10.1.14-h8","status":"unaffected"},{"at":"10.1.15","status":"unaffected"}]
  2. Affected versionversion=10.2.0 <10.2.8 changes=[{"at":"10.2.8","status":"affected"},{"at":"10.2.9-h19","status":"unaffected"},{"at":"10.2.10-h12","status":"unaffected"}]
  3. Affected versionversion=10.2.8 <10.2.8-h19 changes=[{"at":"10.2.8-h19","status":"unaffected"},{"at":"10.2.9-h19","status":"unaffected"},{"at":"10.2.10-h12","status":"unaffected"},{"at":"10.2.11-h10","status":"unaffected"},{"at":"10.2.12-h4","status":"unaffected"},{"at":"10.2.13-h2","status":"unaffected"},{"at":"10.2.14","status":"unaffected"}]
  4. Affected versionversion=11.1.0 <11.1.2-h16 changes=[{"at":"11.1.2-h16","status":"unaffected"},{"at":"11.1.3-h13","status":"unaffected"},{"at":"11.1.4-h7","status":"unaffected"},{"at":"11.1.5","status":"unaffected"}]
  5. Affected versionversion=11.2.0 <11.2.3 changes=[{"at":"11.2.3","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Palo Alto Networks · PAN-OSversion=10.1.14 <10.1.14-h8 changes=[{"at":"10.1.14-h8","status":"unaffected"},{"at":"10.1.15","status":"unaffected"}]; version=10.2.0 <10.2.8 changes=[{"at":"10.2.8","status":"affected"},{"at":"10.2.9-h19","status":"unaffected"},{"at":"10.2.10-h12","status":"unaffected"}]; version=10.2.8 <10.2.8-h19 changes=[{"at":"10.2.8-h19","status":"unaffected"},{"at":"10.2.9-h19","status":"unaffected"},{"at":"10.2.10-h12","status":"unaffected"},{"at":"10.2.11-h10","status":"unaffected"},{"at":"10.2.12-h4","status":"unaffected"},{"at":"10.2.13-h2","status":"unaffected"},{"at":"10.2.14","status":"unaffected"}]; version=11.1.0 <11.1.2-h16 changes=[{"at":"11.1.2-h16","status":"unaffected"},{"at":"11.1.3-h13","status":"unaffected"},{"at":"11.1.4-h7","status":"unaffected"},{"at":"11.1.5","status":"unaffected"}]; version=11.2.0 <11.2.3 changes=[{"at":"11.2.3","status":"unaffected"}]

Published CVSS scores

8.7Palo Alto NetworksCVSS: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
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7Palo Alto NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:A/AU:N/R:U/V:C/RE:M/U:Amber

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
CAPEC-540Overread Buffers
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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