Prisma SD-WAN ION: Improper Certificate Validation
CVE-2026-0244 is a high-severity improper certificate validation vulnerability in Prisma SD-WAN ION from Palo Alto Networks, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 6.5.3-b15, 6.4.3-b8, 6.3.6-b10 as the first without the flaw, so updating Prisma SD-WAN ION to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.22% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Prisma SD-WAN ION to 6.5.3-b15 or 6.4.3-b8 or 6.3.6-b10, whichever matches your release line, or a later version.
- Update Prisma Sd-wan to 6.3.6 or 6.4.3 or 6.5.3, whichever matches your release line, or a later version.
- Read the advisory on security.paloaltonetworks.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Palo Alto Networks | Prisma SD-WAN ION | 6.5.0 up to, but not including, 6.5.3-b15; 6.4.0 up to, but not including, 6.4.3-b8; 6.3.0 up to, but not including, 6.3.6-b10 | 6.5.3-b15, 6.4.3-b8, 6.3.6-b10 |
| Palo Alto Networks | Prisma Sd-wan | 6.3.1 up to, but not including, 6.3.6; 6.4.1 up to, but not including, 6.4.3; 6.5.1 up to, but not including, 6.5.3; 6.3.6; 6.4.3; 6.5.3 | 6.3.6, 6.4.3, 6.5.3 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 5.2 | Medium | CNA (paloaltonetworks.com) |
| CVSS 3.1 | 8.1 | High | NVD |
Official description
An improper certificate validation vulnerability in the Palo Alto Networks Prisma SD-WAN ION enables man-in-the-middle (MitM) attacker to impersonate the controller.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Certificate Validation
The product does not validate, or incorrectly validates, a certificate.
How developers prevent this class of flaw
- Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
- If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
More Improper Certificate Validation vulnerabilities (CWE-295)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Recent Improper Certificate Validation vulnerabilities
- 8.2 High severity
- 7.4 High severity
- 9.1 Critical severity
- 9.1 Critical severity
- 9.1 Critical severity
- 7.4 High severity
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