Junos OS (SRX firewalls)
CVE-2024-47503: SRX4600 and SRX5000 Series: Sequence of specific PIM packets causes a flowd crash
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX4600 and SRX5000 Series allows an unauthenticated and logically 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 (SRX 5000 Series, SRX 4600) 0 | 21.4R3-S9 or later |
| Junos OS (SRX 5000 Series, SRX 4600) 22.2 | 22.2R3-S5 or later |
| Junos OS (SRX 5000 Series, SRX 4600) 22.3 | 22.3R3-S4 or later |
| Junos OS (SRX 5000 Series, SRX 4600) 22.4 | 22.4R3-S4 or later |
| Junos OS (SRX 5000 Series, SRX 4600) 23.2 | 23.2R2-S2 or later |
| Junos OS (SRX 5000 Series, SRX 4600) 23.4 | 23.4R2 or later |
| Junos OS (SRX 5000 Series, SRX 4600) 24.2 | 24.2R1-S1, 24.2R2 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 flow processing daemon (flowd) of Juniper Networks Junos OS on SRX4600 and SRX5000 Series allows an unauthenticated and logically adjacent attacker to cause a Denial-of-Service (DoS).
If in a multicast scenario a sequence of
specific PIM packets is received, this will cause a flowd crash and restart, which leads to momentary service interruption. This issue affects Junos OS on SRX 4600 and SRX 5000 Series:
- All versions before 21.4R3-S9,
- 22.2 versions before 22.2R3-S5,
- 22.3 versions before 22.3R3-S4,
- 22.4 versions before 22.4R3-S4,
- 23.2 versions before 23.2R2-S2,
- 23.4 versions before 23.4R2,
- 24.2 versions before 24.2R1-S1, 24.2R2.
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.