CVE-2025-52986: When RIB sharding is configured each time a show command is executed RPD memory leaks

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	21.2R3-S9 or later
Junos OS 21.4	21.4R3-S11 or later
Junos OS 22.2	22.2R3-S7 or later
Junos OS 22.4	22.4R3-S7 or later
Junos OS 23.2	23.2R2-S4 or later
Junos OS 23.4	23.4R2-S4 or later
Junos OS 24.2	24.2R2 or later
Junos OS 24.4	24.4R1-S2, 24.4R2 or later
Junos OS Evolved 0	22.2R3-S7-EVO or later
Junos OS Evolved 22.4-EVO	22.4R3-S7-EVO or later
Junos OS Evolved 23.2-EVO	23.2R2-S4-EVO or later
Junos OS Evolved 23.4-EVO	23.4R2-S4-EVO or later
Junos OS Evolved 24.2-EVO	24.2R2-EVO or later
Junos OS Evolved 24.4-EVO	24.4R2-EVO or later

Always confirm against the vendor advisory, which lists every fixed hotfix.

What it is

A Missing Release of Memory after Effective Lifetime vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, low privileged user to cause an impact to the availability of the device.

When RIB sharding is enabled and a user executes one of several routing related 'show' commands, a certain amount of memory is leaked. When all available memory has been consumed rpd will crash and restart.

The leak can be monitored with the CLI command:

show task memory detail | match task_shard_mgmt_cookie

where the allocated memory in bytes can be seen to continuously increase with each exploitation.

This issue affects:

Junos OS:

all versions before 21.2R3-S9,
21.4 versions before 21.4R3-S11,
22.2 versions before 22.2R3-S7,
22.4 versions before 22.4R3-S7,
23.2 versions before 23.2R2-S4,
23.4 versions before 23.4R2-S4,
24.2 versions before 24.2R2,
24.4 versions before 24.4R1-S2, 24.4R2;

Junos OS Evolved:

all versions before 22.2R3-S7-EVO
22.4-EVO versions before 22.4R3-S7-EVO,
23.2-EVO versions before 23.2R2-S4-EVO,
23.4-EVO versions before 23.4R2-S4-EVO,
24.2-EVO versions before 24.2R2-EVO,
24.4-EVO versions before 24.4R2-EVO.

Am I affected?

To be exposed to this issue a system needs to be configured with RIB sharding:

[ system processes routing bgp

rib-sharding

]

Workarounds

Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.

Exploitation

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.