CVE detail
CVE-2026-0300: Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability
Source: CISA Known Exploited Vulnerabilities catalog · back to feed
Vendor / product
Palo Alto Networks · PAN-OS
- Date added (KEV)
- May 06, 2026
- CISA due date
- May 09, 2026
- Ransomware campaign use
- Unknown
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch.
Vendor fix: Vendor mitigation
Scorifya interpretation
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Plain English
Technical detail
From CISA
Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka Captive Portal) service that can allow an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.
https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300
References
- https://security.paloaltonetworks.com/CVE-2026-0300MitigationVendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-967325.htmlThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300US Government Resource
Other recent CVEs from Palo Alto Networks
- CVE-2025-0111PAN-OS — Palo Alto Networks PAN-OS File Read Vulnerability
- CVE-2025-0108PAN-OS — Palo Alto Networks PAN-OS Authentication Bypass Vulnerability
- CVE-2024-3393PAN-OS — Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability
- CVE-2024-0012PAN-OS — Palo Alto Networks PAN-OS Management Interface Authentication Bypass Vulnerability
- CVE-2024-9474PAN-OS — Palo Alto Networks PAN-OS Management Interface OS Command Injection Vulnerability
Check your domain's public posture
Scorifya doesn't test for specific CVEs, but if patching Palo Alto Networks changed your headers or TLS, a fresh hardening scan helps confirm nothing regressed externally.