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CVE-2026-0257

Palo Alto Networks PAN-OS•CRITICAL · CVSS 9.1• In the wild In CISA KEV

What is CVE-2026-0257?

Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection. Panorama and Cloud NGFW are not impacted by these issues.

CVSS9.1 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS97% · P100

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWECWE-565

NVD published2026-05-13

NVD last modified2026-06-17

Timeline

2026-05-13Published to the U.S. National Vulnerability Database (NVD)
2026-05-29Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-05-31First covered in a defend.network daily briefing
2026-06-01CISA federal remediation deadline (BOD 22-01)
2026-06-17NVD record last updated

CISA Known Exploited Vulnerability

Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

Added to KEV2026-05-29

Federal patch deadline2026-06-01

Known ransomware useKnown

Affected product

Palo Alto Networks PAN-OS

NVD also lists CPE entries for: Paloaltonetworks Pan-Os, Paloaltonetworks Prisma Access, Siemens Ruggedcom Ape1808 Firmware, Siemens Ruggedcom Ape1808

Remediation Steps

Apply the vendor security update for Paloaltonetworks Pan-Os as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 3 of October 2026 (October 19 – 25)
Vulnerability Priority Report – Week 3 of July 2026 (July 20 – 26)
Vulnerability Priority Report – Week 4 of June 2026 (June 22 – 28)
Vulnerability Priority Report – Week 3 of June 2026 (June 15 – 21)
Vulnerability Priority Report – Week 2 of June 2026 (June 8 – 14)
Vulnerability Priority Report – Week 1 of June 2026 (June 1 – 7)
eMudhra CA compromise, FortiSIEM RCE PoC, PHP emergency patches (2026-10-21)
PAN-OS GlobalProtect actively exploited; Russian infrastructure dismantled; Linux kernel flaw (2026-06-01)
Active exploits: Palo Alto GlobalProtect, CISA credential leak, Linux kernel RCE (2026-05-31)

Related vulnerabilities

CVE-2026-0322 – Palo Alto Networks PAN-OS (same product)
CVE-2026-0300 – Palo Alto Networks PAN-OS (same product)
CVE-2025-25249 – Fortinet Multiple Products (same product)
CVE-2025-61624 – Fortinet Multiple Products (same product)
CVE-2026-110936 – Siemens Software Center (same vendor)
CVE-2026-53362 – Linux Kernel (same vendor)

Palo Alto Networks: 16 known exploited vulnerabilities (CISA KEV) →

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.