PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-IDâ„¢ Authentication Portal (Palo Alto Networks Cloud NGFW)
At a glance
- Source
- NVD
- EPSS
- EPSS 41.71 % · percentile 99 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- palo_alto
- NVD status
- Analyzed
Description
A buffer overflow vulnerability in the User-IDâ„¢ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets. The risk of this issue is greatly reduced if you secure access to the User-IDâ„¢ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses. Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
Weaknesses (CWE)
- CWE-787 — Out-of-bounds Write
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | CRITICAL 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red | palo_alto |
| CVSS 4.0 | HIGH 8.7 | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:A/AU:Y/R:U/V:C/RE:M/U:Red | palo_alto |
| CVSS 4.0 | CRITICAL 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/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:Y/R:U/V:C/RE:M/U:Red | NVD · psirt@paloaltonetworks.com (Secondary) |
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2026-27879
- GCVE · GCVE-0-2026-0300
CERT-FR advisories
- CERTFR-2026-AVI-0537 — Vulnérabilité dans Palo Alto Networks User-ID Authentication Portal · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:paloaltonetworks:pan-os:10.2.0:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.1:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.2:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.3:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.4:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.5:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.6:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h1:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h12:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h16:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h19:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h21:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h24:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h32:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h6:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h8:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.8:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.9:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h10:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h12:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h14:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h17:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h18:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h2:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h21:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h27:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h3:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h30:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h31:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h4:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h5:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h7:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h9:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.11:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.12:*:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:-:*:*:*:*:*:*cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h1:*:*:*:*:*:*- +123 more
Affected products
| Product | Versions |
|---|---|
| Palo Alto Networks · Cloud NGFW | unaffected All |
| Palo Alto Networks · PAN-OS | affected 12.1.0 < 12.1.7 ; affected 11.2.0 < 11.2.12 ; affected 11.1.0 < 11.1.15 ; affected 10.2.0 < 10.2.18-h6 |
| Palo Alto Networks · Prisma Access | unaffected All |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| CISA Known Exploited Vulnerabilities | CC0 1.0 |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |