Junos OS (SRX firewalls)
CVE-2024-30402: The l2ald crashes on receiving telemetry messages from a specific subscription
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) of Juniper Networks Junos OS and Junos OS Evolved 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 20.4 | 20.4R3-S10 or later |
| Junos OS 21.2 | 21.2R3-S7 or later |
| Junos OS 21.4 | 21.4R3-S5 or later |
| Junos OS 22.1 | 22.1R3-S4 or later |
| Junos OS 22.2 | 22.2R3-S3 or later |
| Junos OS 22.3 | 22.3R3-S1 or later |
| Junos OS 22.4 | 22.4R3 or later |
| Junos OS 23.2 | 23.2R1-S2, 23.2R2 or later |
| Junos OS Evolved 21.4-EVO | 21.4R3-S5-EVO or later |
| Junos OS Evolved 22.1-EVO | 22.1R3-S4-EVO or later |
| Junos OS Evolved 22.2-EVO | 22.2R3-S3-EVO or later |
| Junos OS Evolved 22.3-EVO | 22.3R3-S1-EVO or later |
| Junos OS Evolved 22.4-EVO | 22.4R3-EVO or later |
| Junos OS Evolved 23.2-EVO | 23.2R2-EVO or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).
When telemetry requests are sent to the device, and the Dynamic Rendering Daemon (drend) is suspended, the l2ald crashes and restarts due to factors outside the attackers control. Repeated occurrences of these events causes a sustained DoS condition.
This issue affects: Junos OS: * All versions earlier than 20.4R3-S10; * 21.2 versions earlier than 21.2R3-S7; * 21.4 versions earlier than 21.4R3-S5; * 22.1 versions earlier than 22.1R3-S4; * 22.2 versions earlier than 22.2R3-S3; * 22.3 versions earlier than 22.3R3-S1; * 22.4 versions earlier than 22.4R3; * 23.2 versions earlier than 23.2R1-S2, 23.2R2.
Junos OS Evolved:
- All versions earlier than 21.4R3-S5-EVO;
- 22.1-EVO versions earlier than 22.1R3-S4-EVO;
- 22.2-EVO versions earlier than 22.2R3-S3-EVO;
- 22.3-EVO versions earlier than 22.3R3-S1-EVO;
- 22.4-EVO versions earlier than 22.4R3-EVO;
- 23.2-EVO versions earlier than 23.2R2-EVO.
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.