CVE-2024-30388

Traffic loss via malformed LACP packets

Published Apr 12, 2024 · Updated Aug 2, 2024

Improper isolation in Junos OS on affected QFX5000 and EX Series switches allows attackers to interrupt traffic through LACP flaps. The Packet Forwarding Engine processes a specific malformed LACP packet without containing its effect, causing the configured aggregate link to flap. The attacker must be adjacent to a device with an affected LACP configuration; the flap causes traffic loss without reported data disclosure or modification.

CVSS severity7.1
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper isolation in Junos OS on affected QFX5000 and EX Series switches allows attackers to interrupt traffic through LACP flaps. The Packet Forwarding Engine processes a specific malformed LACP packet without containing its effect, causing the configured aggregate link to flap. The attacker must be adjacent to a device with an affected LACP configuration; the flap causes traffic loss without reported data disclosure or modification.

The record

CVE
CVE-2024-30388
Published
Apr 12, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-653, T1498
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20.4R3-S4 <20.4R3-S8
  2. Affected versionversion=21.2R3-S2 <21.2R3-S6
  3. Affected versionversion=21.4R2 <21.4R3-S4
  4. Affected versionversion=22.1R2 <22.1R3-S3
  5. Affected versionversion=22.2 <22.2R3-S1
  6. Affected versionversion=22.3 <22.3R2-S2, 22.3R3
  7. Affected versionversion=22.4 <22.4R2-S1, 22.4R3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=20.4R3-S4 <20.4R3-S8; version=21.2R3-S2 <21.2R3-S6; version=21.4R2 <21.4R3-S4; version=22.1R2 <22.1R3-S3; version=22.2 <22.2R3-S1; version=22.3 <22.3R2-S2, 22.3R3; version=22.4 <22.4R2-S1, 22.4R3

Published CVSS scores

6.5Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1Juniper NetworksCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-653Improper Isolation or Compartmentalization
T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo