CVE-2026-33787

Local traffic interruption via chassisd command handling

Published Apr 9, 2026 · Updated Apr 9, 2026

Improper condition handling in affected Junos OS releases on four SRX models allows local users to interrupt traffic via the CLI. The chassisd daemon fails to handle a specific show chassis command, crashes, and restarts instead of returning an error. Low-privileged CLI access is required; the restart momentarily interrupts all traffic until the chassis modules return online.

CVSS severity6.8
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper condition handling in affected Junos OS releases on four SRX models allows local users to interrupt traffic via the CLI. The chassisd daemon fails to handle a specific show chassis command, crashes, and restarts instead of returning an error. Low-privileged CLI access is required; the restart momentarily interrupts all traffic until the chassis modules return online.

The record

CVE
CVE-2026-33787
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

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-S6
  2. Affected versionversion=23.4 <23.4R2-S7
  3. Affected versionversion=24.2 <24.2R2-S2
  4. Affected versionversion=24.4 <24.4R2
  5. Affected versionversion=25.2 <25.2R1-S1, 25.2R2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <23.2R2-S6; version=23.4 <23.4R2-S7; version=24.2 <24.2R2-S2; version=24.4 <24.4R2; version=25.2 <25.2R1-S1, 25.2R2

Published CVSS scores

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

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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