How severe is CVE-2024-3393?

CVE-2024-3393 has a CVSS 4.0 base score of 8.7 (HIGH). EPSS estimates a 29.1% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2024-3393: PAN-OS: Firewall Denial of Service (DoS) in DNS

CISA Known Exploited Vulnerabilities

Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2024-12-30

Remediation due

2025-01-20

Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

CISA notes
https://security.paloaltonetworks.com/CVE-2024-3393 ; https://nvd.nist.gov/vuln/detail/CVE-2024-3393

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.

Severity

CVSS 4.0 · CNA8.7 HIGH

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

CVSS 4.0 · CNA7.1 HIGH

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

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impactpartial

Exploitation Context

as of October 13, 2026

All KEV statistics→

CISA added CVE-2024-3393 to the KEV catalog 3 days after its CVE record was published. The median for entries added in 2024 is 21.5 days.
It is one of 15 Palo Alto Networks entries in the CISA KEV catalog, and one of 7 added in 2024.
Its current EPSS score (29.1%) is higher than that of 41% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
Palo Alto Networks	Palo Alto Networks Cloud NGFW	All (unaffected)
Palo Alto Networks	Palo Alto Networks PAN-OS	11.2.0 to <11.2.3 (fixed ≥ 11.2.3) 11.1.0 to <11.1.2-h16 (fixed ≥ 11.1.2-h16, 11.1.3-h13, 11.1.4-h7, 11.1.5) 10.2.8 to <10.2.8-h19 (fixed ≥ 10.2.8-h19, 10.2.9-h19, 10.2.10-h12, 10.2.11-h10, 10.2.12-h4, 10.2.13-h2, 10.2.14) 10.1.14 to <10.1.14-h8 (fixed ≥ 10.1.14-h8, 10.1.15)
Palo Alto Networks	Palo Alto Networks PAN-OS	10.2.0 to <10.2.8 (unaffected; fixed ≥ 10.2.9-h19, 10.2.10-h12; affected again ≥ 10.2.8) 11.2.0 to <11.2.3 (fixed ≥ 11.2.3)

References

1 Links

Vendor advisories

https://security.paloaltonetworks.com/CVE-2024-3393

Record Details

Published

2024-12-27

Last updated

2025-10-21

Assigner (CNA)

palo_alto

Credited to

Palo Alto Networks thanks the CERT-EE team for their extra effort in providing invaluable forensic and analytic assistance.

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Tool categories

Application Security Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.

CVE-2024-3393