CVE-2024-21602Network attack vector

Traffic interruption via IPv4 UDP null dereference

Published Jan 12, 2024 · Updated Jun 17, 2025

NULL pointer dereference in Juniper Networks Junos OS Evolved allows remote attackers to interrupt traffic with an IPv4 UDP packet. The Routing Engine packetio process dereferences a null pointer while handling a specific IPv4 UDP packet, then crashes and restarts. A single packet causes a momentary interruption; continued delivery sustains the denial of service, while IPv6 packets do not trigger it.

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

NULL pointer dereference in Juniper Networks Junos OS Evolved allows remote attackers to interrupt traffic with an IPv4 UDP packet. The Routing Engine packetio process dereferences a null pointer while handling a specific IPv4 UDP packet, then crashes and restarts. A single packet causes a momentary interruption; continued delivery sustains the denial of service, while IPv6 packets do not trigger it.

The record

CVE
CVE-2024-21602
Published
Jan 12, 2024
Updated
Jun 17, 2025
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-476, 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

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=21.4-EVO <21.4R3-S6-EVO
  2. Affected versionversion=22.1-EVO <22.1R3-S5-EVO
  3. Affected versionversion=22.2-EVO <22.2R2-S1-EVO, 22.2R3-EVO
  4. Affected versionversion=22.3-EVO <22.3R2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.4-EVO <21.4R3-S6-EVO; version=22.1-EVO <22.1R3-S5-EVO; version=22.2-EVO <22.2R2-S1-EVO, 22.2R3-EVO; version=22.3-EVO <22.3R2-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.

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-476NULL Pointer Dereference
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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