Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
Palo Alto Networks PAN-OS contains a vulnerability in SAML which allows an attacker to bypass authentication.
- Vendor
- Palo Alto Networks
- Product
- PAN-OS
- CVSS
- 10.0
- EPSS (exploit probability)
- 4.4%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2020-2021 being exploited?
Yes. CISA added CVE-2020-2021 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 4.4% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2020-2021 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Palo Alto Networks PAN-OS CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-0322 Palo Alto Networks PAN-OS Code Injection Vulnerabilitywrite-up | [ HIGH ] | — | 2.1% | |
| CVE-2026-0257 PAN-OS GlobalProtect authentication bypassransomware usewrite-up | [ CRITICAL ] | 9.1 | 95.6% | |
| CVE-2026-0300 Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability | [ CRITICAL ] | 9.8 | 41.7% | |
| CVE-2025-0111 Palo Alto Networks PAN-OS File Read Vulnerability | [ MEDIUM ] | 6.5 | 2.0% | |
| CVE-2025-0108 Palo Alto Networks PAN-OS Authentication Bypass Vulnerability | [ CRITICAL ] | 9.1 | 98.5% | |
| CVE-2024-3393 Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability | [ HIGH ] | 7.5 | 30.2% | |
| CVE-2024-9474 Palo Alto Networks PAN-OS Management Interface OS Command Injection Vulnerabilityransomware use | [ HIGH ] | 7.2 | 93.8% | |
| CVE-2024-0012 Palo Alto Networks PAN-OS Management Interface Authentication Bypass Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 99.8% |