CVE-2020-1993: PAN-OS: GlobalProtect Portal PHP session fixation vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-05-13 · updated 2026-06-17
Weakness: CWE-384

Description

The GlobalProtect Portal feature in PAN-OS does not set a new session identifier after a successful user login, which allows session fixation attacks, if an attacker is able to control a user's session ID. This issue affects: All PAN-OS 7.1 and 8.0 versions; PAN-OS 8.1 versions earlier than 8.1.14; PAN-OS 9.0 versions earlier than 9.0.8.

Affected products

Palo Alto Networks PAN-OS: from 7.1.0 through 7.1.26; from 8.0.0 through 8.0.20; from 8.1.0 through 8.1.13; from 9.0.0 through 9.0.7
Palo Alto Networks PAN-OS: from 8.1 before 8.1.14; from 9.0 before 9.0.8; 8.0.*, 7.1.* — fixed in 8.1.14, 9.0.8

How to fix

Upgrade to a fixed version: Palo Alto Networks PAN-OS 8.1.14, 9.0.8. Check the vendor advisory for mitigations.

References

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