PAN-OS: Invalid URLs in an External Dynamic List (EDL) can Lead to Firewall Outage
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Palo Alto Networks | PAN-OS | 9.0 to before 9.0.14; 9.1 to before 9.1.9; 10.0 to before 10.0.5 | 9.0.14, 9.1.9, 10.0.5 | Patch available | CNA |
- PAN-OS VendorPalo Alto Networks Affected 9.0 to before 9.0.14; 9.1 to before 9.1.9; 10.0 to before 10.0.5 Fixed in 9.0.14, 9.1.9, 10.0.5 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:* | 9.0.0 to before 9.0.14; 9.1.0 to before 9.1.9; 10.0.0 to before 10.0.5 | Vulnerable | CyberArk Software, a Palo Alto Networks Company |
- cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:* Versions 9.0.0 to before 9.0.14; 9.1.0 to before 9.1.9; 10.0.0 to before 10.0.5 Vulnerable ·CyberArk Software, a Palo Alto Networks Company
Remediation
- Fix · CNA PAN-OS (Palo Alto Networks) Fixed in 9.0.14, 9.1.9, 10.0.5
Timeline
- 2026-10-02 Threatist record created from CVE-2021-3048
- 2026-10-03 Alias added: GHSA-9g4g-449x-h99g
References
More Palo Alto Networks vulnerabilities
- TI-2024-08782 Expedition: Unauthenticated OS Command Injection Vulnerability Leads to Firewall Credential Disclosure KEVCVSS 4.0CRITICAL 9.9
- TI-2024-03172 PAN-OS: Arbitrary File Creation Leads to OS Command Injection Vulnerability in GlobalProtect KEVCVSS 3.1CRITICAL 10.0
- TI-2020-01936 PAN-OS: Authentication Bypass in SAML Authentication KEVCVSS 3.1CRITICAL 10.0
- TI-2017-11675 Palo Alto Networks PAN-OS before 6.1.19, 7.0.x before 7.0.19, 7.1.x before 7.1.14, and… KEVCVSS 3.1CRITICAL 9.8
- TI-2026-00239 PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal KEVCVSS 4.0CRITICAL 9.3
- TI-2024-08784 Expedition: SQL Injection Leads to Firewall Admin Credential Disclosure KEVCVSS 4.0CRITICAL 9.2
Sources
- CVE-2021-3048 · CVE Program
- CVE-2021-3048 · NVD
- FIRST EPSS
- GHSA-9g4g-449x-h99g · GitHub Advisory Database · CC BY 4.0
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