J-Web Junos OS (25.2R2) Improper Cert Chain Trust
CVE-2026-33779 Published on April 9, 2026
Junos OS: SRX Series: Insufficient certificate verification for device to SD cloud communication
An Improper Following of a Certificate's Chain of Trust vulnerability in J-Web of Juniper Networks Junos OS on SRX Series allows a PITM to intercept the communication of the device and get access to confidential information and potentially modify it.
When an SRX device is provisioned to connect to Security Director (SD) cloud, it doesn't perform sufficient verification of the received server certificate. This allows a PITM to intercept the communication between the SRX and SD cloud and access credentials and other sensitive information.
This issue affects Junos OS:
* all versions before 22.4R3-S9,
* 23.2 versions before 23.2R2-S6,
* 23.4 versions before 23.4R2-S7,
* 24.2 versions before 24.2R2-S3,
* 24.4 versions before 24.4R2-S2,
* 25.2 versions before 25.2R1-S2, 25.2R2.
Vulnerability Analysis
CVE-2026-33779 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
Improper Following of a Certificate's Chain of Trust
The software does not follow, or incorrectly follows, the chain of trust for a certificate back to a trusted root certificate, resulting in incorrect trust of any resource that is associated with that certificate.
Products Associated with CVE-2026-33779
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Affected Versions
Juniper Networks Junos OS:- Before 22.4R3-S9 is affected.
- Version 23.2 and below 23.2R2-S6 is affected.
- Version 23.4 and below 23.4R2-S7 is affected.
- Version 24.2 and below 24.2R2-S3 is affected.
- Version 24.4 and below 24.4R2-S2 is affected.
- Version 25.2 and below 25.2R1-S2, 25.2R2 is affected.