How to check if you are exposed to CVE-2020-2021
- Find every Palo Alto Networks PAN-OS system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
- Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
- Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2020-2021.
US federal agencies had to fix this by 2022-04-15. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.
Timeline
- · Added to CISA's Known Exploited Vulnerabilities catalog
- · Fix-by date for US federal agencies, passed 1,661 days ago
Weakness type
More exploited Palo Alto Networks vulnerabilities
CISA lists 16 exploited Palo Alto Networks vulnerabilities. The closest matches:
- CVE-2026-0322Palo Alto Networks PAN-OS Code Injection VulnerabilityAdded 2026-10-14
- CVE-2026-0257Palo Alto Networks PAN-OS Authentication Bypass VulnerabilityAdded 2026-05-29
- CVE-2026-0300Palo Alto Networks PAN-OS Out-of-bounds Write VulnerabilityAdded 2026-05-06
- CVE-2025-0111Palo Alto Networks PAN-OS File Read VulnerabilityAdded 2025-02-20
- CVE-2025-0108Palo Alto Networks PAN-OS Authentication Bypass VulnerabilityAdded 2025-02-18
- CVE-2024-3393Palo Alto Networks PAN-OS Malicious DNS Packet VulnerabilityAdded 2024-12-30
- CVE-2024-9474Palo Alto Networks PAN-OS Management Interface OS Command Injection VulnerabilityAdded 2024-11-18
- CVE-2024-0012Palo Alto Networks PAN-OS Management Interface Authentication Bypass VulnerabilityAdded 2024-11-18
Keep going
Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.