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6.5 Medium

CVE-2021-3055 An improper restriction of XML external entity (XXE) reference vulnerability in the Palo Alto Networks PAN-OS web…

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.

Affected products and versions

Product Affected versions Fixed in
PAN-OS 10.0 10.0 → < 10.0.6 10.0.6
PAN-OS 9.1 9.1 → < 9.1.10 9.1.10
PAN-OS 9.0 9.0 → < 9.0.14 9.0.14
PAN-OS 8.1 8.1 → < 8.1.20 8.1.20

Other CVEs of PAN-OS

The 197 CVEs of PAN-OS →
CVE-2026-0316 A stored cross-site scripting (XSS) vulnerability in Palo Alto Networks PAN-OS® software enables a malicious… 1.1 Low CVE-2026-0317 A denial of service vulnerability in Palo Alto Networks PAN-OS software enables an authenticated user with a read-only… 1.2 Low CVE-2026-0318 A stack-based buffer overflow vulnerability in the log processing functionality of Palo Alto Networks PAN-OS® software… 4.6 Medium CVE-2026-0319 An improper input handling vulnerability in the GlobalProtect™ gateway of Palo Alto Networks PAN-OS software enables… 4.9 Medium
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