CVE-2024-30388

Junos OS: QFX5000 Series and EX Series: Specific malformed LACP packets will cause flaps

MEDIUM

6.5

CVSS Score

Published: April 12, 2024 at 03:09 PM UTC

Updated: June 17, 2026 at 07:26 AM UTC

1 product affected across 1 vendorJunos

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

An Improper Isolation or Compartmentalization vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series and EX Series allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS). If a specific malformed LACP packet is received by a QFX5000 Series, or an EX4400, EX4100 or EX4650 Series device, an LACP flap will occur resulting in traffic loss. This issue affects Junos OS on QFX5000 Series, and on EX4400, EX4100 or EX4650 Series: * 20.4 versions from 20.4R3-S4 before 20.4R3-S8, * 21.2 versions from 21.2R3-S2 before 21.2R3-S6, * 21.4 versions from 21.4R2 before 21.4R3-S4, * 22.1 versions from 22.1R2 before 22.1R3-S3, * 22.2 versions before 22.2R3-S1, * 22.3 versions before 22.3R2-S2, 22.3R3, * 22.4 versions before 22.4R2-S1, 22.4R3.

Affected

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

Junos · Juniper Networks

95%

20.4R3-S4 ≤ v < 20.4R3-S821.2R3-S2 ≤ v < 21.2R3-S621.4R2 ≤ v < 21.4R3-S422.1R2 ≤ v < 22.1R3-S322.2 ≤ v < 22.2R3-S122.3 ≤ v < 22.3R2-S2, 22.3R322.4 ≤ v < 22.4R2-S1, 22.4R320.4 r3-s4 20.4 r3-s5 20.4 r3-s6 20.4 r3-s7 20.4R3-S4 21.2 r3-s2 21.2 r3-s3 21.2 r3-s4 21.2 r3-s5 21.2R3-S2 21.4 r2 21.4 r2-s1 21.4 r2-s2 21.4 r3 21.4 r3-s1 21.4 r3-s2 21.4R2 22.1 r2 22.1 r2-s1 22.1 r2-s2 22.1 r3 22.1 r3-s1 22.1 r3-s2 22.1R2 22.2 22.2 r1 22.2 r1-s1 22.2 r1-s2 22.2 r2 22.2 r2-s1 22.2 r2-s2 22.2 r3 22.3 22.3 r1 22.3 r1-s1 22.3 r1-s2 22.3 r2 22.3 r2-s1 22.3 r3 22.4 22.4 r1 22.4 r1-s1 22.4 r1-s2 22.4 r2 22.4 r3

Affected range stops below 20.4R3-S8, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R3-S6, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-S1, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R2-S2, 22.3R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R2-S1, 22.4R3, so it looks safe — our inference, not a vendor statement

juniper-ex4100 (environment) · juniper-ex4100-f (environment) · juniper-ex4100-h (environment) · juniper-ex4400 (environment) · juniper-ex4650 (environment) · juniper-qfx5110 (environment) · juniper-qfx5120 (environment) · juniper-qfx5130 (environment) · juniper-qfx5200 (environment) · juniper-qfx5210 (environment) · juniper-qfx5220 (environment) · juniper-qfx5230-64cd (environment) · juniper-qfx5240 (environment) · juniper-qfx5241 (environment) · juniper-qfx5700 (environment)