Home/CVE/An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interf
CVE

CVE-2021-3055

An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interf

An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web interface enables an authenticated administrator to read any arbitrary file from the file system and send a specifically crafted request to the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20.

PAN-OS 9.0 versions earlier than PAN-OS 9.0.14.

PAN-OS 9.1 versions earlier than PAN-OS 9.1.10.

PAN-OS 10.0 versions earlier than PAN-OS 10.0.6. This issue does not affect Prisma Access.

MEDIUM · CVSS 6.5 EPSS 0.00282
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-611Improper Restriction of XML External Entity Reference
CWE-611Improper Restriction of XML External Entity Reference
▤

Affected Products & Versions

4
paloaltonetworks pan-os>= 8.1.0 and < 8.1.20
paloaltonetworks pan-os>= 9.0.0 and < 9.0.14
paloaltonetworks pan-os>= 9.1.0 and < 9.1.10
paloaltonetworks pan-os>= 10.0.0 and < 10.0.6
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · psirt@paloaltonetworks.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Sep 2021 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://security.paloaltonetworks.com/CVE-2021-3055Vendor Advisory
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