CISA Known Exploited Vulnerability
This vulnerability is actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities catalog.
Remediation Deadline: May 9, 2026
Description
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.
Required Action
https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300
Risk Assessment
ELEVATEDIn CISA KEV
Details
- Severity
- High
- CISA KEV
- Yes
- Ransomware
- Unknown
- Articles
- 0
Timeline
Published
May 6, 2026
Added to KEV
May 6, 2026
Remediation Due
May 9, 2026