CVE-2026-33779Network attack vector

Traffic interception via insufficient certificate-chain validation

Published Apr 9, 2026 · Updated Apr 9, 2026

Certificate-chain validation failure in Junos OS on SRX Series allows man-in-the-middle attackers to intercept Security Director cloud traffic. J-Web accepts the Security Director cloud server certificate without sufficiently validating its chain of trust. Exploitation requires a provisioned SRX device and a network position between the endpoints; intercepted traffic exposes credentials and other sensitive data and permits modification in transit.

CVSS severity8.3
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Certificate-chain validation failure in Junos OS on SRX Series allows man-in-the-middle attackers to intercept Security Director cloud traffic. J-Web accepts the Security Director cloud server certificate without sufficiently validating its chain of trust. Exploitation requires a provisioned SRX device and a network position between the endpoints; intercepted traffic exposes credentials and other sensitive data and permits modification in transit.

The record

CVE
CVE-2026-33779
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-296, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <22.4R3-S9
  2. Affected versionversion=23.2 <23.2R2-S6
  3. Affected versionversion=23.4 <23.4R2-S7
  4. Affected versionversion=24.2 <24.2R2-S3
  5. Affected versionversion=24.4 <24.4R2-S2
  6. Affected versionversion=25.2 <25.2R1-S2, 25.2R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <22.4R3-S9; version=23.2 <23.2R2-S6; version=23.4 <23.4R2-S7; version=24.2 <24.2R2-S3; version=24.4 <24.4R2-S2; version=25.2 <25.2R1-S2, 25.2R2

Published CVSS scores

6.5Juniper NetworksCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
8.3Juniper NetworksCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-296Improper Following of a Certificate's Chain of Trust
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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