CVE-2026-33794Network attack vector

PFE crash via corrupted unilist ECMP state

Published Jul 9, 2026 · Updated Jul 9, 2026

Improper exceptional-condition handling in Junos OS Evolved on PTX Series allows remote attackers to crash the PFE via routing updates. In 24.4R2-EVO before 24.4R2-S3-EVO and 25.2 before 25.2R2-EVO, evo-aftmand corrupts internal state while processing continuous updates that produce unified-list ECMP routes. Exploitation requires an event sequence outside the attacker’s direct control, and recovery requires an FPC restart or system reboot.

CVSS severity8.2
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exceptional-condition handling in Junos OS Evolved on PTX Series allows remote attackers to crash the PFE via routing updates. In 24.4R2-EVO before 24.4R2-S3-EVO and 25.2 before 25.2R2-EVO, evo-aftmand corrupts internal state while processing continuous updates that produce unified-list ECMP routes. Exploitation requires an event sequence outside the attacker’s direct control, and recovery requires an FPC restart or system reboot.

The record

CVE
CVE-2026-33794
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-754, T1499.004
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

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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=24.4R2-EVO <24.4R2-S3-EVO
  2. Affected versionversion=25.2 <25.2R2, 25.2R2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=24.4R2-EVO <24.4R2-S3-EVO; version=25.2 <25.2R2, 25.2R2-EVO

Published CVSS scores

8.2Juniper Networks, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
5.9Juniper Networks, Inc.CVSS:3.1/AV:N/AC:H/PR:N/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.

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)
Vectornetwork
Privilegesunauthenticated
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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