title: PAN-OS: Invalid URLs in an External Dynamic List (EDL) can Lead to Firewall Outage
description: Certain invalid URL entries contained in an External Dynamic List (EDL) cause the Device Server daemon (devsrvr) to stop responding. This condition causes subsequent commits on the firewall to fail and prevents administrators from performing commits and configuration changes even though the firewall remains otherwise functional. If the firewall then restarts, it results in a denial-of-service (DoS) condition and the firewall stops processing traffic. This issue impacts: PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.9; PAN-OS 10.0 versions earlier than PAN-OS 10.0.5. PAN-OS 8.1 and PAN-OS 10.1 versions are not impacted.
problem types: CWE-20 Improper Input Validation
affected:
{
product: PAN-OS
vendor: Palo Alto Networks
versions:
status: unaffected, version: 10.1.*
status: unaffected, version: 8.1.*
changes: [at: 9.0.14, status: unaffected], lessThan: 9.0.14, status: affected, version: 9.0, versionType: custom
changes: [at: 9.1.9, status: unaffected], lessThan: 9.1.9, status: affected, version: 9.1, versionType: custom
changes: [at: 10.0.5, status: unaffected], lessThan: 10.0.5, status: affected, version: 10.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 5.9
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
solutions: This issue is fixed in PAN-OS 9.0.14, PAN-OS 9.1.9, PAN-OS 10.0.5, and all later PAN-OS versions.
If a firewall encounters this problem, you will require TAC assistance to make the firewall operational again.
workarounds: You can prevent this issue by removing all invalid URL entries from source EDLs or removing the EDL from your configuration.
Additionally, do not configure EDLs from websites that you do not trust.