Junos OS (SRX firewalls)
CVE-2026-102185: An attacker causes an rpd denial of service when EVPN multihoming preference-based DF election is used
A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote network attacker to cause a denial of service via EVPN multihoming with preference-based designated-forwarder election.
Published Juniper Networks advisory JSA112187
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 | 23.2R2-S7.7 or later |
| Junos OS 23.4 | 23.4R2-S8.13 or later |
| Junos OS 24.2 | 24.2R2-S5.5 or later |
| Junos OS 24.4 | 24.4R2-S5 or later |
| Junos OS 25.2 | 25.2R2-S2 or later |
| Junos OS 25.4 | 25.4R1-S3 or later |
| Junos OS 26.2 | 26.2R1-S2 or later |
| Junos OS Evolved 0 | 23.2R2-S7.7-EVO or later |
| Junos OS Evolved 23.4 | 23.4R2-S8.11-EVO or later |
| Junos OS Evolved 24.2 | 24.2R2-S5.6-EVO or later |
| Junos OS Evolved 24.4 | 24.4R2-S5-EVO or later |
| Junos OS Evolved 25.2 | 25.2R2-S2-EVO or later |
| Junos OS Evolved 25.4 | 25.4R1-S3-EVO or later |
| Junos OS Evolved 26.2 | 26.2R1-S2-EVO or later |
| Junos OS Evolved 23.4X100 | See the advisory |
| Junos OS Evolved 25.2X100 | 25.2X100-D35-EVO or later |
| Junos OS Evolved 25.4X300 | 25.4X300-D40-EVO or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
In short
A flaw in the routing protocol daemon of Junos OS allows a remote attacker to trigger an infinite loop. By sending specific EVPN multihoming traffic that exploits preference-based designated-forwarder election, an attacker can cause a denial of service. This attack can be executed over the network without requiring authentication or user interaction.
Written by a language model from the vendor's description. Versions, fixes and exploitation status on this page come straight from the vendor and CISA.
The vendor's description
A Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a remote network attacker to cause a denial of service via EVPN multihoming with preference-based designated-forwarder election.
Am I affected?
[ protocols bgp ... family evpn signaling ] [ interfaces <ifd> flexible-vlan-tagging ] [ interfaces <ifd> encapsulation flexible-ethernet-services ] [ interfaces <ifd> esi <esi> ] [ interfaces <ifd> esi all-active ] [ interfaces <ifd> esi df-election-type preference value <n> ] [ interfaces <ifd> unit <u> encapsulation vlan-bridge ] [ interfaces <ifd> unit <u> vlan-id <v> ] [ routing-instances <mac-vrf> instance-type mac-vrf ] [ routing-instances <mac-vrf> service-type vlan-based ] [ routing-instances <mac-vrf> route-distinguisher <rd> ] [ routing-instances <mac-vrf> vrf-target <rt> ] [ routing-instances <mac-vrf> protocols evpn ] [ routing-instances <mac-vrf> vlans <name> vlan-id <v> ] [ routing-instances <mac-vrf> vlans <name> interface <ifd>.<u> ]
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 19 Oct 2026.