Is It On KEV?

Palo Alto Networks PAN-OS

YES - ON THE CISA KEV LIST
CVE-2026-0300

Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability

CISA catalog due date2026-05-09
186 days past due
EPSS exploit probability (next 30 days)41.7% · 99percentile
From CVE publication to KEV listing0 days (2026-05-06 → 2026-05-06)
Remediation window (KEV listing to due date)3 days
Days on the KEV list189 days
Date added to KEV2026-05-06
Known ransomware campaign useUnknown
VendorPalo Alto Networks
ProductPAN-OS
Weaknesses (CWE)CWE-787

Palo Alto Networks: 16 entries (0.9% of all KEV entries are from this vendor); 3 added in 2026.

BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.

Your BOD 26-04 window (SSVC tier helper)

Your remediation window ends:

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 (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. 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.

Notes

https://security.paloaltonetworks.com/CVE-2026-0300 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0300

References

Other KEV entries for this vendor: Palo Alto Networks

Palo Alto Networks - Vendors with KEV entries

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