What is CVE-2021-3055?

CVE-2021-3055 is a medium-severity vulnerability in Palo Alto Networks Pan-Os, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 6.5/10. Published 2021-09-08.

How severe is CVE-2021-3055?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XXE in Palo Alto Networks Pan-Os

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.

Vulnerability class: XXE (XML External Entity)

EPSS: 0.011 (61.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H.

Affected products

Palo Alto Networks Pan-os — versions 10.1.*, 9.0, 9.1
Paloaltonetworks Pan-os

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

psirt@paloaltonetworks.com (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-3055?: CVE-2021-3055 is a medium-severity vulnerability in Palo Alto Networks Pan-Os, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 6.5/10. Published 2021-09-08.
How severe is CVE-2021-3055?: Medium severity. CVSS v3 base score is 6.5 out of 10.