CISA KEV entry

CVE-2026-0257Palo Alto Networks PAN-OS Authentication Bypass Vulnerability

Palo Alto Networks PAN-OS. Added to the CISA Known Exploited Vulnerabilities catalogue on 29 May 2026.

Data status: a source is stale

Last synced 5 November 2026, 11:38 UTC CISA catalogue version 2026.11.04 (released 4 November 2026) 1,768 entries Updated manually

Date added: 2026-05-29
Federal due date: 2026-06-01 3 days after it was added; passed at the sync of 2026-11-05
Known ransomware use: Known
Forensic triage (BOD 26-04): No
CVSS: 7.8 High CVSS 4.0, scored by psirt@paloaltonetworks.com
EPSS: 95.64% percentile 99.8, scored 2026-11-04
CISA SSVC: Exploitation active, automatable no, technical impact total
NVD status: Analyzed published 2026-05-13, 16 days before the KEV listing

BOD 26-04 remediation window

With CISA's SSVC answers for this CVE (automatable: no, technical impact: total), BOD 26-04 Table 1 gives 3 days and forensic triage on a publicly exposed asset (row 3) and 14 days on an asset that is not publicly exposed (row 11) ^S06. The catalogue due date, 3 days after the date added, was set before BOD 26-04 took effect on 10 June 2026 ^S06. The directive binds US federal civilian executive branch agencies only.

What CISA says

Short description

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

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

https://security.paloaltonetworks.com/CVE-2026-0257 ; https://nvd.nist.gov/vuln/detail/CVE-2026-0257

CWE in the catalogue

CWE-565

Official links

CISA KEV catalogue entry cisa.gov
NVD record nvd.nist.gov

Vendor advisory and patch links

References NVD tags Vendor Advisory or Patch, exactly as NVD lists them.

https://security.paloaltonetworks.com/CVE-2026-0257 Vendor Advisory

Links in CISA's notes

NVD details

CWE (NVD): CWE-565 by psirt@paloaltonetworks.com
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
CVSS versions in NVD: V31, V40
Last modified in NVD: 2026-10-26T14:10:00.130

Where each value comes from

Source and fetch time of every field on this page
Field	Source	Fetched, UTC	State
Catalogue fields	CISA KEV JSON, version 2026.11.04	2026-11-05 11:38	current
NVD published, status, CVSS, CWE, vendor links	NVD CVE API 2.0; CVSS: NVD (psirt@paloaltonetworks.com)	2026-11-03 12:37	current at 2026-11-05 11:38
EPSS	FIRST EPSS API, scores of 2026-11-04	2026-11-05 11:38	current
CISA SSVC	CISA ADP (via NVD), record of 2026-05-28	2026-11-03 12:37	current

This product uses data from the NVD API but is not endorsed or certified by the NVD. CISA does not endorse Sysprobs. Methodology.

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