CVE-2026-33803Network attack vector

Information disclosure and CPU consumption via exposed port

Published Jul 9, 2026 · Updated Jul 9, 2026

Improper channel restriction in Juniper Networks Junos OS Evolved allows remote attackers to disclose limited data and consume CPU. Incorrect process initialization binds an internal-only communication endpoint to a network-reachable open port, so ingress packets reach the process. No authentication is required; the disclosed data is unspecified, and the availability effect is limited to additional CPU consumption.

CVSS severity6.9
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper channel restriction in Juniper Networks Junos OS Evolved allows remote attackers to disclose limited data and consume CPU. Incorrect process initialization binds an internal-only communication endpoint to a network-reachable open port, so ingress packets reach the process. No authentication is required; the disclosed data is unspecified, and the availability effect is limited to additional CPU consumption.

The record

CVE
CVE-2026-33803
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-923
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <23.2R2-S7-EVO
  2. Affected versionversion=23.4 <23.4R2-S8-EVO
  3. Affected versionversion=24.2 <24.2R2-S5-EVO
  4. Affected versionversion=24.4 <24.4R2-S4-EVO
  5. Affected versionversion=25.2 <25.2R2-S1-EVO
  6. Affected versionversion=25.4 <25.4R1-S2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <23.2R2-S7-EVO; version=23.4 <23.4R2-S8-EVO; version=24.2 <24.2R2-S5-EVO; version=24.4 <24.4R2-S4-EVO; version=25.2 <25.2R2-S1-EVO; version=25.4 <25.4R1-S2-EVO

Published CVSS scores

6.9Juniper NetworksCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
6.5Juniper NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

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-923Improper Restriction of Communication Channel to Intended Endpoints

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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