CVE-2025-21595

published 2025-04-09

CVE-2025-21595: A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved…

high 7.1 CVSS 4.0

AV A AC L AT N PR N UI N VC N VI N VA H SC N SI N SA L E X CR X IR X AR X MAV X MAC X MAT X MPR X MUI X MVC X MVI X MVA X MSC X MSI X MSA X S X AU X R X V X RE X U X

A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause an FPC to crash, leading to Denial of Service (DoS).

On all Junos OS and Junos OS Evolved platforms, in an EVPN-VXLAN scenario, when specific ARP packets are received on an IPv4 network, or specific NDP packets are received on an IPv6 network, kernel heap memory leaks, which eventually leads to an FPC crash and restart.

This issue does not affect MX Series platforms.
Heap size growth on FPC can be seen using below command.

user@host> show chassis fpc
Temp CPU Utilization (%) CPU Utilization (%) Memory Utilization (%)
Slot State (C) Total Interrupt 1min 5min 15min DRAM (MB) Heap Buffer
0 Online 45 3 0 2 2 2 32768 19 0 <<<<<<< Heap increase in all fPCs

This issue affects Junos OS:

* All versions before 21.2R3-S7,
* 21.4 versions before 21.4R3-S4,
* 22.2 versions before 22.2R3-S1,
* 22.3 versions before 22.3R3-S1,
* 22.4 versions before 22.4R2-S2, 22.4R3.

and Junos OS Evolved:

* All versions before 21.2R3-S7-EVO,
* 21.4-EVO versions before 21.4R3-S4-EVO,
* 22.2-EVO versions before 22.2R3-S1-EVO,
* 22.3-EVO versions before 22.3R3-S1-EVO,

* 22.4-EVO versions before 22.4R3-EVO.

Affected

24 ranges

Vendor	Product	Version range	Fixed in
juniper	junos	< 21.2	21.2
juniper	junos	—	—
juniper	junos	—	—
juniper	junos	—	—
juniper	junos	—	—
juniper	junos	—	—
juniper	junos_os	—	—
juniper	junos_os_evolved	< 21.2	21.2
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	mx_series	—	—
juniper_networks	junos_os	< 21.2R3-S7	21.2R3-S7
juniper_networks	junos_os	>= 21.4 < 21.4R3-S4	21.4R3-S4
juniper_networks	junos_os	>= 22.2 < 22.2R3-S1	22.2R3-S1
juniper_networks	junos_os	>= 22.3 < 22.3R3-S1	22.3R3-S1
juniper_networks	junos_os	>= 22.4 < 22.4R2-S2, 22.4R3	22.4R2-S2, 22.4R3
juniper_networks	junos_os_evolved	< 21.2R3-S7-EVO	21.2R3-S7-EVO
juniper_networks	junos_os_evolved	>= 21.4-EVO < 21.4R3-S4-EVO	21.4R3-S4-EVO
juniper_networks	junos_os_evolved	>= 22.2-EVO < 22.2R3-S1-EVO	22.2R3-S1-EVO
juniper_networks	junos_os_evolved	>= 22.3-EVO < 22.3R3-S1-EVO	22.3R3-S1-EVO
juniper_networks	junos_os_evolved	>= 22.4-EVO < 22.4R3-EVO	22.4R3-EVO

CWE-401