NVD

CVE-2025-21595 Detail

Description

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: Juniper Networks, Inc.

CVSS-B 7.1 HIGH

Vector: 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

CVSS 3.x Severity and Vector Strings:

CNA: Juniper Networks, Inc.

Base Score: 6.5 MEDIUM

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://supportportal.juniper.net/JSA96450	Juniper Networks, Inc.	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-401	Missing Release of Memory after Effective Lifetime	Juniper Networks, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

Initial Analysis by NIST 1/26/2026 2:35:51 PM

Action

Type

Old Value

New Value

Added

CPE Configuration

Record truncated, showing 2048 of 6275 characters.
View Entire Change Record

OR
          *cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:* versions up to (excluding) 21.2
          *cpe:2.3:o:juniper:junos:21.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.2:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.4:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:21.4:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22

Added

Reference Type

Juniper Networks, Inc.: https://supportportal.juniper.net/JSA96450 Types: Vendor Advisory

New CVE Received from Juniper Networks, Inc. 4/09/2025 4:15:25 PM

Action	Type	New Value
Added	Description	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.
Added	CVSS V4.0	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
Added	CVSS V3.1	AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added	CWE	CWE-401
Added	Reference	https://supportportal.juniper.net/JSA96450

Quick Info

CVE Dictionary Entry:
CVE-2025-21595
NVD Published Date:
04/09/2025
NVD Last Modified:
01/26/2026
Source:
Juniper Networks, Inc.

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