CVE-2021-3048: Palo Alto Networks PAN-OS

Medium severity, CVSS 5.9. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Palo Alto Networks PAN-OS: from 9.0.0, before 9.0.14 (fixed in 9.0.14); from 9.1.0, before 9.1.9 (fixed in 9.1.9); from 10.0.0, before 10.0.5 (fixed in 10.0.5)

Published 2021-08-11. Last modified 2026-06-17.