CVE-2024-3393 | PAN-OS: Firewall Denial of Service (DoS) in DNS Security Using a Specially Crafted Packet

Exp

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.

Published: 2024-12-27 Last update: 2025-11-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-3393 is rated Critical Active Threat (96.5/100): CVSS High severity, with high exploitation likelihood (EPSS 79.72%, 99th percentile). CISA KEV confirms active exploitation (added 2024-12-30) affecting Palo Alto Networks / PAN-OS. a weakness (CWE-754) Unauthenticated remote administrative access may be possible. EPSS rose +2.03% over the last day, indicating growing attacker interest. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2024-3393

Name: Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability · CISA KEV detail

Exploit added: 2024-12-30

Action due: 2025-01-20

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

Exploit prediction scoring system (EPSS) score for CVE-2024-3393

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-10 77.69% 79.72% +2.03%
2 2026-03-17 77.23% 77.69% +0.47%
3 2026-03-11 — 77.23% —

Full EPSS history (27 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-3393

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.7 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:C/RE:M/U:Amber Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N)
No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:H)
High availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:L)
Limited availability impact on subsequent systems.
Exploit maturity (threat) (E:X)
Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X)
Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X)
Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X)
Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X)
Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X)
Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X)
Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X)
Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X)
Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X)
Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X)
Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X)
Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X)
Not evaluated.
Automatable (supplemental) (AU:N)
No: attackers cannot reliably automate reconnaissance through exploitation for this issue.
Recovery (supplemental) (R:U)
User: manual user intervention is needed to recover services.
Value density (supplemental) (V:C)
Concentrated: a single exploit event controls rich resources (e.g., a central server).
Vulnerability response effort (supplemental) (RE:M)
Moderate effort (remote update, disable subsystem, simple upgrade with minor service impact).
Provider urgency (supplemental) (U:AMBER)
Amber: provider rates moderate urgency.
 — — [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2024-3393

Affected software / configurations for CVE-2024-3393

Vendor Product Version Raw CPE
paloaltonetworks pan-os >= 11.1.0, <= 11.1.1 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 11.2.0, < 11.2.3 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h2:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h4:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h6:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.8 cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.8 cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:h10:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.8 cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:h13:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.8 cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:h15:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.8 cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:h18:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.8 cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:h3:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.8 cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:h4:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.9 cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.9 cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:h1:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.9 cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:h11:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.9 cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:h14:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.9 cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:h16:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.9 cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:h18:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.9 cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:h9:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h10:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h2:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h3:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h4:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h5:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h7:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h9:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.11 cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.11 cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:h1:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.11 cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:h2:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.11 cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:h3:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.11 cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:h4:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.11 cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:h6:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.11 cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:h9:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.12 cpe:2.3:o:paloaltonetworks:pan-os:10.2.12:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.12 cpe:2.3:o:paloaltonetworks:pan-os:10.2.12:h1:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.12 cpe:2.3:o:paloaltonetworks:pan-os:10.2.12:h2:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.12 cpe:2.3:o:paloaltonetworks:pan-os:10.2.12:h3:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h1:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.2 cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:-:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.2 cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:h1:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.2 cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:h12:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.2 cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:h14:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.2 cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:h15:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.2 cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:h3:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.2 cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:h4:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.2 cpe:2.3:o:paloaltonetworks:pan-os:11.1.2:h9:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.3 cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:-:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.3 cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:h1:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.3 cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:h10:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.3 cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:h11:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.3 cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:h2:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.3 cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:h4:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.3 cpe:2.3:o:paloaltonetworks:pan-os:11.1.3:h6:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:-:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h1:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h4:*:*:*:*:*:*
paloaltonetworks prisma_access — cpe:2.3:a:paloaltonetworks:prisma_access:-:*:*:*:*:*:*:*

References for CVE-2024-3393

cvelogic Threat Intelligence