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Medium severity6.5NVD Advisory· Published Sep 8, 2021· Updated Jun 17, 2026

CVE-2021-3055

CVE-2021-3055

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Paloaltonetworks/Pan OS3 versions
    cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*range: >=8.1.0,<8.1.20
    • (no CPE)range: <8.1.20, <9.0.14, <9.1.10, <10.0.6
    • (no CPE)range: 9.0

Patches

Vulnerability mechanics

References

1

News mentions

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