CVE-2026-33786

Traffic interruption via show chassis chassisd crash

Published Apr 9, 2026 · Updated Apr 9, 2026

Improper exception handling in Juniper Networks Junos OS 24.4 allows local users to interrupt traffic through a chassisd restart. A specific show chassis CLI command causes chassisd to crash and restart; Juniper has not disclosed the command arguments or internal condition. Low-privilege CLI access is required, and the restart momentarily interrupts all traffic until every module returns online.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exception handling in Juniper Networks Junos OS 24.4 allows local users to interrupt traffic through a chassisd restart. A specific show chassis CLI command causes chassisd to crash and restart; Juniper has not disclosed the command arguments or internal condition. Low-privilege CLI access is required, and the restart momentarily interrupts all traffic until every module returns online.

The record

CVE
CVE-2026-33786
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-754, T1499.004
Attack vector
local
Privileges
authenticated

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=24.4 <24.4R1-S3, 24.4R2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Juniper Networks · Junos OSversion=24.4 <24.4R1-S3, 24.4R2

Published CVSS scores

6.8Juniper NetworksCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
5.5Juniper NetworksCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1499.004Application or System Exploitation

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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