CISA KEV · Known exploitedCritical

CVE-2020-2021

Palo Alto Networks PAN-OS

When Security Assertion Markup Language (SAML) authentication is enabled and the 'Validate Identity Provider Certificate' option is disabled (unchecked), improper verification of signatures in PAN-OS SAML authentication enables an unauthenticated network-based attacker to access protected resources. The attacker must have network access to the vulnerable server to exploit this vulnerability. This issue affects PAN-OS 9.1 versions earlier than PAN-OS 9.1.3; PAN-OS 9.0 versions earlier than PAN-OS 9.0.9; PAN-OS 8.1 versions earlier than PAN-OS 8.1.15, and all versions of PAN-OS 8.0 (EOL). Thi...

CVSS: 10
EPSS: 4.36%
CISA KEV: Listed
Published: 2020.06.30

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability4.36%

Technical severityCVSS 10

Vulnerability overview

Affected product and versions

Product: Palo Alto Networks PAN-OS
Affected versions: 8.0.*, 8.1, 9.0, 9.1, >= 8.0.0 <= 8.0.20, >= 8.1.0 < 8.1.15, >= 9.0.0 < 9.0.9, >= 9.1.0 < 9.1.3
Fixed versions: 8.1.15, 9.0.9, 9.1.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.04.15

1
Identify
Confirm that Palo Alto Networks PAN-OS and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE: CWE-347
KEV added: 2022.03.25
Ransomware use: 확인됨