CVE-2024-21604

Junos OS Evolved: A high rate of specific traffic will cause a complete system outage

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

An Allocation of Resources Without Limits or Throttling vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). If a high rate of specific valid packets are processed by the routing engine (RE) this will lead to a loss of connectivity of the RE with other components of the chassis and thereby a complete and persistent system outage. Please note that a carefully designed lo0 firewall filter will block or limit these packets which should prevent this issue from occurring. The following log messages can be seen when this issue occurs: <host> kernel: nf_conntrack: nf_conntrack: table full, dropping packet This issue affects Juniper Networks Junos OS Evolved: * All versions earlier than 20.4R3-S7-EVO; * 21.2R1-EVO and later versions; * 21.4-EVO versions earlier than 21.4R3-S5-EVO; * 22.1-EVO versions earlier than 22.1R3-S2-EVO; * 22.2-EVO versions earlier than 22.2R3-EVO; * 22.3-EVO versions earlier than 22.3R2-EVO; * 22.4-EVO versions earlier than 22.4R2-EVO.

Affected

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

Junos OS Evolved · Juniper Networks

60%

v < 20.4R3-S7-EVO21.2-EVO ≤ v < 21.2*-EVO21.4-EVO ≤ v < 21.4R3-S5-EVO22.1-EVO ≤ v < 22.1R3-S2-EVO22.2-EVO ≤ v < 22.2R3-EVO22.3-EVO ≤ v < 22.3R2-EVO22.4-EVO ≤ v < 22.4R2-EVO21.2-EVO 21.4-EVO 22.1-EVO 22.2-EVO 22.3-EVO 22.4-EVO

Affected range stops below 20.4R3-S7-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2*-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S5-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 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

Affected range stops below 22.4R2-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

https://supportportal.juniper.net/JSA75745

References (2)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA75745

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-770

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