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CVE-2026-0300 CISA KEV · Actively exploited

Out-of-bounds write in Paloaltonetworks Pan OS

CVSS score

9.8

EPSS probability

%31.7

Risk score

6.2

Published

5 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-0300 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

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.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-0300 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1paloaltonetworkspan-os View
2paloaltonetworkspan-os View
3paloaltonetworkspan-os View
4paloaltonetworkspan-os View
5paloaltonetworkspan-os View
6paloaltonetworkspan-os View
7paloaltonetworkspan-os View
8paloaltonetworkspan-os View
9paloaltonetworkspan-os View
10paloaltonetworkspan-os View
11paloaltonetworkspan-os View
12paloaltonetworkspan-os View
13paloaltonetworkspan-os View
14paloaltonetworkspan-os View
15paloaltonetworkspan-os View
16paloaltonetworkspan-os View
17paloaltonetworkspan-os View
18paloaltonetworkspan-os View
19paloaltonetworkspan-os View
20paloaltonetworkspan-os View
21paloaltonetworkspan-os View
22paloaltonetworkspan-os View
23paloaltonetworkspan-os View
24paloaltonetworkspan-os View
25paloaltonetworkspan-os View
26paloaltonetworkspan-os View
27paloaltonetworkspan-os View
28paloaltonetworkspan-os View
29paloaltonetworkspan-os View
30paloaltonetworkspan-os View
31paloaltonetworkspan-os View
32paloaltonetworkspan-os View
33paloaltonetworkspan-os View
34paloaltonetworkspan-os View
35paloaltonetworkspan-os View
36paloaltonetworkspan-os View
37paloaltonetworkspan-os View
38paloaltonetworkspan-os View
39paloaltonetworkspan-os View
40paloaltonetworkspan-os View
41paloaltonetworkspan-os View
42paloaltonetworkspan-os View
43paloaltonetworkspan-os View
44paloaltonetworkspan-os View
45paloaltonetworkspan-os View
46paloaltonetworkspan-os View
47paloaltonetworkspan-os View
48paloaltonetworkspan-os View
49paloaltonetworkspan-os View
50paloaltonetworkspan-os View
51paloaltonetworkspan-os View
52paloaltonetworkspa-1410 View
53paloaltonetworkspa-1420 View
54paloaltonetworkspa-3410 View
55paloaltonetworkspa-3420 View
56paloaltonetworkspa-3430 View
57paloaltonetworkspa-3440 View
58paloaltonetworkspa-410 View
59paloaltonetworkspa-410r View
60paloaltonetworkspa-410r-5g View
61paloaltonetworkspa-415 View
62paloaltonetworkspa-415-5g View
63paloaltonetworkspa-440 View
64paloaltonetworkspa-445 View
65paloaltonetworkspa-450 View
66paloaltonetworkspa-450r View
67paloaltonetworkspa-450r-5g View
68paloaltonetworkspa-455 View
69paloaltonetworkspa-455-5g View
70paloaltonetworkspa-455r-5g View
71paloaltonetworkspa-460 View
72paloaltonetworkspa-501 View
73paloaltonetworkspa-505 View
74paloaltonetworkspa-510 View
75paloaltonetworkspa-520 View
76paloaltonetworkspa-540 View
77paloaltonetworkspa-5410 View
78paloaltonetworkspa-5420 View
79paloaltonetworkspa-5430 View
80paloaltonetworkspa-5440 View
81paloaltonetworkspa-5445 View
82paloaltonetworkspa-545-poe View
83paloaltonetworkspa-5450 View
84paloaltonetworkspa-550 View
85paloaltonetworkspa-5540 View
86paloaltonetworkspa-555-poe View
87paloaltonetworkspa-5550 View
88paloaltonetworkspa-5560 View
89paloaltonetworkspa-5570 View
90paloaltonetworkspa-5580 View
91paloaltonetworkspa-560 View
92paloaltonetworkspa-7500 View
93paloaltonetworkspa-7500-dpc-a View
94paloaltonetworksvm-100 View
95paloaltonetworksvm-300 View
96paloaltonetworksvm-50 View
97paloaltonetworksvm-500 View
98paloaltonetworksvm-700 View
99siemensruggedcom ape1808 firmware View
100siemensruggedcom ape1808 View
Total affected vendors: 2|Products: 100

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
9.8CVSS V31CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD
9.3CVSS V40CRITICALCVSS: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:RedNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

This CVE is marked as actively exploited in the CISA KEV catalogue, but no verified, downloadable public PoC or Metasploit module has been found yet. Evidence of active exploitation does not mean that public exploit code exists.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-0300 is associated with the following CWEs:

CWE-787: Out-of-bounds Write

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-0300 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://security.paloaltonetworks.com/CVE-2026-0300vendor-advisoryhttps://cert-portal.siemens.com/productcert/html/ssa-967325.htmlnvdhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-0300nvd

CVSS Vector Radar Chart

9.8 / 10
Attack VectorNetworkComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

P
paloaltonetworks logo
paloaltonetworks
S
siemens logo
siemens

Weakness Type (CWE & CAPEC)

CWE-787

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