CVE-2024-21612Network attack vector

Routing Engine restart via malformed OFP packets

Published Jan 12, 2024 · Updated Jun 17, 2025

Improper structure handling in Junos OS Evolved 22.4 before 22.4R2-EVO and earlier branches allows remote attackers to restart the Routing Engine. The OFP service accepts specific syntactically invalid TCP packets on an open OFP port and crashes instead of rejecting them, which restarts the Routing Engine. The port must be open and reachable without authentication; a continuing packet stream repeatedly restarts the engine and sustains a service interruption.

CVSS severity7.5
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper structure handling in Junos OS Evolved 22.4 before 22.4R2-EVO and earlier branches allows remote attackers to restart the Routing Engine. The OFP service accepts specific syntactically invalid TCP packets on an open OFP port and crashes instead of rejecting them, which restarts the Routing Engine. The port must be open and reachable without authentication; a continuing packet stream repeatedly restarts the engine and sustains a service interruption.

The record

CVE
CVE-2024-21612
Published
Jan 12, 2024
Updated
Jun 17, 2025
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-228, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record 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 <21.2R3-S7-EVO
  2. Affected versionversion=21.3 <21.3R3-S5-EVO
  3. Affected versionversion=21.4 <21.4R3-S5-EVO
  4. Affected versionversion=22.1 <22.1R3-S4-EVO
  5. Affected versionversion=22.2 <22.2R3-S3-EVO
  6. Affected versionversion=22.3 <22.3R3-EVO
  7. Affected versionversion=22.4 <22.4R2-EVO, 22.4R3-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <21.2R3-S7-EVO; version=21.3 <21.3R3-S5-EVO; version=21.4 <21.4R3-S5-EVO; version=22.1 <22.1R3-S4-EVO; version=22.2 <22.2R3-S3-EVO; version=22.3 <22.3R3-EVO; version=22.4 <22.4R2-EVO, 22.4R3-EVO

Published CVSS scores

7.5Juniper NetworksCVSS:3.1/AV:N/AC:L/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-228Improper Handling of Syntactically Invalid Structure
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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