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CVE-2024-21602

Junos OS Evolved: ACX7024, ACX7100-32C and ACX7100-48L: Traffic stops when a specific IPv4 UDP packet is received by the RE

HIGH
7.5
CVSS Score
Published: January 12, 2024 at 12:54 AM UTC
Updated: June 17, 2026 at 07:09 AM UTC
2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

A NULL Pointer Dereference vulnerability in Juniper Networks Junos OS Evolved on ACX7024, ACX7100-32C and ACX7100-48L allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). If a specific IPv4 UDP packet is received and sent to the Routing Engine (RE) packetio crashes and restarts which causes a momentary traffic interruption. Continued receipt of such packets will lead to a sustained DoS. This issue does not happen with IPv6 packets. This issue affects Juniper Networks Junos OS Evolved on ACX7024, ACX7100-32C and ACX7100-48L: * 21.4-EVO versions earlier than 21.4R3-S6-EVO; * 22.1-EVO versions earlier than 22.1R3-S5-EVO; * 22.2-EVO versions earlier than 22.2R2-S1-EVO, 22.2R3-EVO; * 22.3-EVO versions earlier than 22.3R2-EVO. This issue does not affect Juniper Networks Junos OS Evolved versions earlier than 21.4R1-EVO.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved· Juniper
95%
21.421.4 r121.4 r1-s121.4 r1-s221.4 r221.4 r2-s121.4 r2-s221.4 r321.4 r3-s121.4 r3-s221.4 r3-s321.4 r3-s421.4 r3-s522.122.1 r122.1 r1-s122.1 r1-s222.1 r222.1 r2-s122.1 r322.1 r3-s122.1 r3-s222.1 r3-s322.1 r3-s422.222.2 r122.2 r1-s122.2 r222.322.3 r122.3 r1-s122.3 r1-s2
Junos OS Evolved· Juniper Networks
60%
21.4-EVO ≤ v < 21.4R3-S6-EVO22.1-EVO ≤ v < 22.1R3-S5-EVO22.2-EVO ≤ v < 22.2R2-S1-EVO, 22.2R3-EVO22.3-EVO ≤ v < 22.3R2-EVO21.4-EVO22.1-EVO22.2-EVO22.3-EVO
Affected range stops below 21.4R3-S6-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.1R3-S5-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.2R2-S1-EVO, 22.2R3-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.3R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: [email protected]
https://supportportal.juniper.net/JSA75743
Technical DescriptionThird Party Advisory
Source: [email protected]
https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHjuniper
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-476

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