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CVE-2024-39534

Junos OS Evolved: Connections to the network and broadcast address accepted

MEDIUM
5.4
CVSS Score
Published: October 11, 2024 at 03:18 PM UTC
Updated: June 17, 2026 at 07:42 AM UTC
2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

An Incorrect Comparison vulnerability in the local address verification API of Juniper Networks Junos OS Evolved allows an unauthenticated network-adjacent attacker to create sessions or send traffic to the device using the network and broadcast address of the subnet assigned to an interface. This is unintended and unexpected behavior and can allow an attacker to bypass certain compensating controls, such as stateless firewall filters. This issue affects Junos OS Evolved: * All versions before 21.4R3-S8-EVO,  * 22.2-EVO before 22.2R3-S4-EVO,  * 22.3-EVO before 22.3R3-S4-EVO,  * 22.4-EVO before 22.4R3-S3-EVO,  * 23.2-EVO before 23.2R2-S1-EVO,  * 23.4-EVO before 23.4R1-S2-EVO, 23.4R2-EVO.

Affected

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

Junos OS Evolved· Juniper
95%
v < 21.421.421.4 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-s521.4 r3-s621.4 r3-s722.222.2 r122.2 r1-s122.2 r1-s222.2 r222.2 r2-s122.2 r2-s222.2 r322.2 r3-s122.2 r3-s222.2 r3-s322.322.3 r122.3 r1-s122.3 r1-s222.3 r222.3 r2-s122.3 r2-s222.3 r322.3 r3-s122.3 r3-s222.3 r3-s322.422.4 r122.4 r1-s122.4 r1-s222.4 r222.4 r2-s122.4 r2-s222.4 r322.4 r3-s122.4 r3-s223.223.2 r123.2 r1-s123.2 r1-s223.2 r223.423.4 r123.4 r1-s123.4 r2
Junos OS Evolved· Juniper Networks
60%
v < 21.4R3-S8-EVO22.2-EVO ≤ v < 22.2R3-S4-EVO22.3-EVO ≤ v < 22.3R3-S4-EVO22.4-EVO ≤ v < 22.4R3-S3-EVO23.2-EVO ≤ v < 23.2R2-S1-EVO23.4-EVO ≤ v < 23.4R1-S2-EVO, 23.4R2-EVO22.2-EVO22.3-EVO22.4-EVO23.2-EVO23.4-EVO
Affected range stops below 21.4R3-S8-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.2R3-S4-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.3R3-S4-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.4R3-S3-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.2R2-S1-EVO, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.4R1-S2-EVO, 23.4R2-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

References (1)

Vendor Advisory
Source: [email protected]
https://supportportal.juniper.net/JSA88105

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

5.4MEDIUMjuniper
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-697

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