Palo Alto Networks PAN-OS Vulnerability: CVE-2026-0258
CVE-2026-0258 is a server-side request forgery vulnerability in Palo Alto Networks PAN-OS. The practical concern is simple: in affected IKEv2 VPN configurations, an unauthenticated attacker may be able to make the firewall send outbound requests to attacker-chosen destinations, which can support internal probing or denial-of-service conditions.
In This Lesson
Assess CVE-2026-0258 by separating confirmed vendor facts from exposure and business impact. The response sequence prioritizes inventory, supported remediation, mitigation, and verification.
Quick Learning Map
Keep this three-step view in mind as you work through the detailed lesson.
Confirm applicability
Match affected products, versions, configurations, and reachable management surfaces.
Reduce exposure
Apply vendor fixes or mitigations and restrict access while changes are scheduled.
Verify and monitor
Confirm the installed version, review logs and indicators, and document residual risk.
Palo Alto Networks PAN-OS Vulnerability: CVE-2026-0258 at a Glance
Use this summary before moving into the detailed explanations, examples, commands, and checks.
Core focus
Assess CVE-2026-0258 by separating confirmed vendor facts from exposure and business impact.
Key connection
Confirm applicability → Reduce exposure → Verify and monitor
Practical outcome
The response sequence prioritizes inventory, supported remediation, mitigation, and verification.
1. Internal Context
- Vulnerability classification: Medium.
- Environment risk can be assessed as no impact or very low impact when effective controls are in place.
- Protection is available through Palo Alto Networks Threat Prevention signature Threat ID 510014.
- This aligns with a stronger NGFW posture when Threat Prevention is enabled and IKEv2 VPN exposure is limited to trusted peers.
This assessment should still be validated against your actual firewall versions, VPN gateway configuration, IKEv2 exposure, and active security profiles.
2. Vulnerability Details
| Item | Detail |
|---|---|
| Type | Server-Side Request Forgery (SSRF) |
| CWE | CWE-918 |
| Affected area | IKEv2 certificate URL fetching logic in PAN-OS |
| Authentication | Unauthenticated network-based attack path |
The key point is that the firewall can become a proxy for attacker-controlled requests. That makes the issue important even without direct code execution.
3. Impact Analysis
What an attacker may be able to do
- Trigger outbound requests from the firewall to internal network endpoints.
- Trigger outbound requests from the firewall to external systems.
- Use SSRF behavior for internal network probing.
- Contribute to resource exhaustion or denial-of-service scenarios.
What this does not directly indicate
- No direct remote code execution is indicated by the CVE summary.
- No direct privilege escalation is indicated.
- Integrity impact is not the primary concern; availability impact is the larger operational issue.
4. Severity and Risk
| Metric | Value |
|---|---|
| CVSS v4.0 | 4.8 Medium |
| Attack vector | Network |
| Authentication required | None |
| Exploit complexity | Low |
| Known active exploitation | No known exploitation reported by the vendor at publication time |
This is not in the same operational class as a direct RCE vulnerability, but it still deserves attention because it is network-reachable and does not require authentication when the vulnerable exposure path exists.
5. Exposure Conditions
CVE-2026-0258 is relevant when the PAN-OS firewall has a site-to-site VPN gateway configured and IKEv2 is in use. If IKEv2 is not enabled or not exposed, practical risk is significantly reduced.
- Confirm whether site-to-site VPN gateways exist on the affected firewalls.
- Confirm whether IKEv2 is enabled on those gateways.
- Confirm whether peers are restricted to known trusted addresses.
- Review whether Threat Prevention profiles are applied where relevant.
6. Affected and Not Affected Products
| Status | Products |
|---|---|
| Affected | PAN-OS firewall software in impacted 10.2.x, 11.1.x, 11.2.x, and 12.1.x releases below fixed builds. |
| Not affected | Prisma Access and Cloud NGFW are listed as not affected. |
7. Remediation and Mitigation
Primary vendor fix
Upgrade PAN-OS to a fixed release for your branch. Examples of fixed builds include:
- PAN-OS 12.1: 12.1.4-h5, 12.1.7, or later fixed builds.
- PAN-OS 11.2: 11.2.10-h6, 11.2.12, or later fixed builds.
- PAN-OS 11.1: 11.1.10-h25, 11.1.15, or later fixed builds.
- PAN-OS 10.2: 10.2.18-h6 or later fixed builds.
Interim controls
- Enable Threat Prevention signatures, including Threat ID 510014.
- Monitor IKEv2 negotiation anomalies.
- Monitor unexpected outbound traffic from firewall interfaces.
- Restrict IKEv2 VPN access to trusted peers only.
- Review VPN gateway exposure and remove unused configurations.
8. Exploitability Status
- No known exploitation in the wild was reported by the vendor at publication time.
- No public proof-of-concept is confirmed in this practical note.
- The issue is still worth tracking because the attack vector is network-based and unauthenticated.
9. Practical Risk Summary
Operational risk is low to moderate when IKEv2 is exposed externally or when VPN gateways are misconfigured. Risk is lower when Threat Prevention is enabled, VPN peers are restricted, and unused IKEv2 exposure is removed.
For environments using Prisma Access or Cloud NGFW only, this specific PAN-OS firewall exposure does not apply based on the affected-product scope.
10. Quick Executive Summary
- CVE-2026-0258 is an SSRF issue in PAN-OS IKEv2 certificate URL handling.
- The attack path is unauthenticated and network-based when the vulnerable VPN exposure exists.
- CVSS v4.0 score is 4.8, Medium.
- Primary impact is SSRF behavior and potential denial of service, not direct RCE.
- It is mainly relevant when IKEv2 site-to-site VPN is enabled.
- Fix by upgrading PAN-OS or apply interim protection with Threat Prevention and restricted IKEv2 exposure.