Junos OS (SRX firewalls)
CVE-2024-39558: Receipt of specific PIM packet causes rpd crash when PIM is configured along with MoFRR
An Unchecked Return Value vulnerability in the Routing Protocol Daemon (rpd) on Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows a logically adjacent, unauthenticated attacker sending a specific PIM packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS), when PIM is configured with Multicast-only Fast Reroute (MoFRR).
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 0 | 20.4R3-S10 or later |
| Junos OS 21.2 | 21.2R3-S7 or later |
| Junos OS 21.4 | 21.4R3-S6 or later |
| Junos OS 22.1 | 22.1R3-S5 or later |
| Junos OS 22.2 | 22.2R3-S3 or later |
| Junos OS 22.3 | 22.3R3 or later |
| Junos OS 22.4 | 22.4R2 or later |
| Junos OS Evolved 0 | 20.4R3-S10-EVO or later |
| Junos OS Evolved 21.2R1-EVO | 21.2*-EVO or later |
| Junos OS Evolved 21.4-EVO | 21.4R3-S9-EVO or later |
| Junos OS Evolved 22.1-EVO | 22.1R3-S5-EVO or later |
| Junos OS Evolved 22.2-EVO | 22.2R3-S3-EVO or later |
| Junos OS Evolved 22.3-EVO | 22.3R3-EVO or later |
| Junos OS Evolved 22.4-EVO | 22.4R2-EVO or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Unchecked Return Value vulnerability in the Routing Protocol Daemon (rpd) on Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows a logically adjacent, unauthenticated attacker sending a specific PIM packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS), when PIM is configured with Multicast-only Fast Reroute (MoFRR). Continued receipt and processing of this packet may create a sustained Denial of Service (DoS) condition.
This issue is observed on Junos and Junos Evolved platforms where PIM is configured along with MoFRR. MoFRR tries to select the active path, but due to an internal timing issue, rpd is unable to select the forwarding next-hop towards the source, resulting in an rpd crash.
This issue affects:
Junos OS:
- All versions before 20.4R3-S10,
- from 21.2 before 21.2R3-S7,
- from 21.4 before 21.4R3-S6,
- from 22.1 before 22.1R3-S5,
- from 22.2 before 22.2R3-S3,
- from 22.3 before 22.3R3,
- from 22.4 before 22.4R2;
Junos OS Evolved:
- All versions before 20.4R3-S10 -EVO,
- All versions of 21.2-EVO,
- from 21.4-EVO before 21.4R3-S9-EVO,
- from 22.1-EVO before 22.1R3-S5-EVO,
- from 22.2-EVO before 22.2R3-S3-EVO,
- from 22.3-EVO before 22.3R3-EVO,
- from 22.4-EVO before 22.4R2-EVO.
Am I affected?
This issue only affects systems with PIM and MoFRR enabled. For example:
[ protocols pim ] [ routing-options multicast stream-protection ]
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.