CVE-2024-21612

Junos OS Evolved: Specific TCP traffic causes OFP core and restart of RE

HIGH

7.5

CVSS Score

Published: January 12, 2024 at 12:55 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 Improper Handling of Syntactically Invalid Structure vulnerability in Object Flooding Protocol (OFP) service of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). On all Junos OS Evolved platforms, when specific TCP packets are received on an open OFP port, the OFP crashes leading to a restart of Routine Engine (RE). Continuous receipt of these specific TCP packets will lead to a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS Evolved * All versions earlier than 21.2R3-S7-EVO; * 21.3 versions earlier than 21.3R3-S5-EVO ; * 21.4 versions earlier than 21.4R3-S5-EVO; * 22.1 versions earlier than 22.1R3-S4-EVO; * 22.2 versions earlier than 22.2R3-S3-EVO ; * 22.3 versions earlier than 22.3R3-EVO; * 22.4 versions earlier than 22.4R2-EVO, 22.4R3-EVO.

Affected

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

Junos OS Evolved · Juniper

95%

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

Junos OS Evolved · Juniper Networks

60%

v < 21.2R3-S7-EVO21.3 ≤ v < 21.3R3-S5-EVO21.4 ≤ v < 21.4R3-S5-EVO22.1 ≤ v < 22.1R3-S4-EVO22.2 ≤ v < 22.2R3-S3-EVO22.3 ≤ v < 22.3R3-EVO22.4 ≤ v < 22.4R2-EVO, 22.4R3-EVO21.3 21.4 22.1 22.2 22.3 22.4

Affected range stops below 21.2R3-S7-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3R3-S5-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-S4-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R2-EVO, 22.4R3-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/JSA75753

References (2)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA75753

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:N

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-228NVD-CWE-Other

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