Medium6.5Juniper Networks

Medium [CVE-2026-33779] 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

This medium-severity Juniper Networks advisory covers CVE-2026-33779 affecting Junos OS, Junos, SRX.

CVE-2026-33779 Published Apr 9, 2026Updated by vendor Jun 17, 2026

CVE-2026-33779

Affected products & platforms

Juniper NetworksSRXFirewallJunos

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Summary

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,

Affected versions

* all versions before 22

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

22.4R3-S9
23.2R2-S6
23.4R2-S7
24.2R2-S3
24.4R2-S2
25.2R1-S2

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation

Upgrade to a fixed release: 22.4R3-S9, 23.2R2-S6, 23.4R2-S7, 24.2R2-S3, 24.4R2-S2, 25.2R1-S2. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

NVD discovery recordNVD
Independent discovery and scoring cross-reference. Vendor remediation guidance takes precedence. Discovered from the machine-readable feed https://services.nvd.nist.gov/rest/json/cves/2.0; this link opens the NVD record for CVE-2026-33779 instead of the raw feed document.
NIST National Vulnerability Database

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-33779NVD CVE.org MITRE

Official resources

Junos OS software downloads & install/upgrade (target: 22.4R3-S9 / 23.2R2-S6 / 23.4R2-S7)
Official documentation
This advisory names 22.4R3-S9 / 23.2R2-S6 / 23.4R2-S7 as the first fixed releases — official upgrade documentation for Junos OS on SRX / MX / EX / QFX.
Junos OS release & EOL / support dates
Release notes
Confirm your train is still supported and pick a fixed maintenance release.
Juniper Security Advisories portal
Official documentation
Canonical Juniper SIRT advisory portal — search here for the full JSA text and revisions.

Discussion(0)

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