Vulnerability details
CVE-2026-0300
Actively exploited
Palo Alto Networks PAN-OSSiemens RUGGEDCOM APE1808
PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal
CVSS 4.0
9.3Critical
Official description
A buffer overflow vulnerability in the User-ID™ 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-ID™ 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.3Critical | 4.0 | CVEProject cvelistV5 (CNA) (palo_alto) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Palo Alto Networks | PAN-OS | 10.2.0 ≤ v < 10.2.18-h6 | CVEProject cvelistV5 (CNA) |
| Palo Alto Networks | PAN-OS | 11.1.0 ≤ v < 11.1.15 | CVEProject cvelistV5 (CNA) |
| Palo Alto Networks | PAN-OS | 11.2.0 ≤ v < 11.2.12 | CVEProject cvelistV5 (CNA) |
| Palo Alto Networks | PAN-OS | 12.1.0 ≤ v < 12.1.7 | CVEProject cvelistV5 (CNA) |
| Siemens | RUGGEDCOM APE1808 | All | CVEProject cvelistV5 (CNA) |
References and advisories
3
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Details
- Published
- 2026-05-06
- Last updated
- 2026-10-15
- State
- Published
- Assigner (CNA)
- palo_alto
- Kolun priority
- 89 · Critical
CISA KEV catalog
- Date added
- 2026-05-06
- Due date
- 2026-05-09
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
41.71%
Probability of exploitation in 30 days
98.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-787Out-of-bounds Write