Junos OS (SRX firewalls)
CVE-2024-30388: QFX5000 Series and EX Series: Specific malformed LACP packets will cause flaps
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).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Junos OS (QFX5000 Series, EX Series) 20.4R3-S4 | 20.4R3-S8 or later |
| Junos OS (QFX5000 Series, EX Series) 21.2R3-S2 | 21.2R3-S6 or later |
| Junos OS (QFX5000 Series, EX Series) 21.4R2 | 21.4R3-S4 or later |
| Junos OS (QFX5000 Series, EX Series) 22.1R2 | 22.1R3-S3 or later |
| Junos OS (QFX5000 Series, EX Series) 22.2 | 22.2R3-S1 or later |
| Junos OS (QFX5000 Series, EX Series) 22.3 | 22.3R2-S2, 22.3R3 or later |
| Junos OS (QFX5000 Series, EX Series) 22.4 | 22.4R2-S1, 22.4R3 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Am I affected?
To be affected by this issue the device must have an LACP configuration as shown in the following example must be present:
[ interfaces <interface> ...ether-options 802.3ad ae<number> ] [ interfaces ae<number> aggregated-ether-options lacp ]
Workarounds
There are no known workarounds for this issue.
Exploitation
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.