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CVE-2026-0257: Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
Palo Alto Networks PAN-OS · in CISA KEV since 2026-05-29
2026-05-29added to KEV
2026-06-01federal remediation due date
95.16%EPSS exploit probability (30 days) 99.9th percentile
7.8 HIGHCVSS 4.0
Knownknown ransomware use
16days from NVD publication to KEV
What it is
Palo Alto Networks PAN-OS contains an authentication bypass vulnerability that allows attackers to bypass security restrictions and establish an unauthorized VPN connection.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| CWE | CWE-565 |
|---|---|
| CVSS vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:A/V:D/RE:M/U:Red |
| NVD published | 2026-05-13 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-0257.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.