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    CVE-2021-3055

    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.

    Published:Sep 8, 2021
    Last Modified:Nov 21, 2024
    EPS:Sep 8, 2021
    EPSS Score:0.00316
    CVSS Score:6.5

    Affected Products

    Vendor
    Paloaltonetworks
    Product
    Pan-os

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-221 Data Serialization External Entities Blowup

    Related CVEs

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    CVE-2026-0280 (CVSS 1.7) — An IPv6 packet processing vulnerability in the dataplane of Palo Alto Networks PAN-OS® software enables an una…
    CVE-2026-0281 (CVSS 2.1) — An information disclosure vulnerability in Palo Alto Networks PAN-OS® software enables an unauthenticated atta…
    CVE-2026-0282 (CVSS 2.7) — A file deletion vulnerability in Palo Alto Networks PAN-OS® software enables an unauthenticated attacker with …
    CVE-2026-0283 (CVSS 4.5) — An authentication bypass vulnerability in Large Scale VPN ( LSVPN) functionality of Palo Alto Networks PAN-OS …
    CVE-2026-0284 (CVSS 4.7) — An XML injection vulnerability in the Large Scale VPN (LSVPN) functionality of Palo Alto Networks PAN-OS® soft…
    CVE-2026-0285 (CVSS 4.7) — A server-side request forgery (SSRF) vulnerability in Palo Alto Networks PAN-OS software enables an authentica…
    CVE-2026-0286 (CVSS 6) — A command injection vulnerability in the management plane of Palo Alto Networks PAN-OS® software enables an au…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High