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CVE-2024-30389

Junos OS: EX4300 Series: Firewall filter not blocking egress traffic

MEDIUM
5.8
CVSS Score
Published: April 12, 2024 at 03:24 PM UTC
Updated: June 17, 2026 at 07:26 AM UTC
18 products affected across 2 vendorsJunosEx4300Ex4300-48T-Dc-Afi

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Severity
MEDIUM5.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

An Incorrect Behavior Order vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on EX4300 Series allows an unauthenticated, network-based attacker to cause an integrity impact to networks downstream of the vulnerable device. When an output firewall filter is applied to an interface it doesn't recognize matching packets but permits any traffic. This issue affects Junos OS 21.4 releases from 21.4R1 earlier than 21.4R3-S6. This issue does not affect Junos OS releases earlier than 21.4R1.

Affected

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

Junos· Juniper Networks
95%
21.4 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-s5
Vendor states this is fixed in 21.4 (unaffected)
juniper-ex4300 (environment) · juniper-ex4300-24p (environment) · juniper-ex4300-24p-s (environment) · juniper-ex4300-24t (environment) · juniper-ex4300-24t-s (environment) · juniper-ex4300-32f (environment) · juniper-ex4300-32f-dc (environment) · juniper-ex4300-32f-s (environment) · juniper-ex4300-48mp (environment) · juniper-ex4300-48mp-s (environment) · juniper-ex4300-48p (environment) · juniper-ex4300-48p-s (environment) · juniper-ex4300-48t (environment) · juniper-ex4300-48t-afi (environment) · juniper-ex4300-48t-dc (environment) · juniper-ex4300-48t-dc-afi (environment) · juniper-ex4300-48t-s (environment)
Ex4300· Juniperdevice
80%
All versions
Ex4300-24P· Juniperdevice
80%
All versions
Ex4300-24P-S· Juniperdevice
80%
All versions
Ex4300-24T· Juniperdevice
80%
All versions
Ex4300-24T-S· Juniperdevice
80%
All versions
Ex4300-32F· Juniperdevice
80%
All versions
Ex4300-32F-Dc· Juniperdevice
80%
All versions
Ex4300-32F-S· Juniperdevice
80%
All versions
Ex4300-48Mp· Juniperdevice
80%
All versions

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]
http://supportportal.juniper.net/JSA79185
Technical DescriptionIssue Tracking
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:N/SC:N/SI:L/SA:N

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

5.8MEDIUMjuniper
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-696NVD-CWE-Other

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