NVD

CVE-2025-52946 Detail

Description

A Use After Free vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an attacker sending a BGP update with a specifically malformed AS PATH to cause rpd to crash, resulting in a Denial of Service (DoS). Continuous receipt of the malformed AS PATH attribute will cause a sustained DoS condition. On all Junos OS and Junos OS Evolved platforms, the rpd process will crash and restart when a specifically malformed AS PATH is received within a BGP update and traceoptions are enabled. This issue only affects systems with BGP traceoptions enabled and requires a BGP session to be already established. Systems without BGP traceoptions enabled are not impacted by this issue. This issue affects: Junos OS: * All versions before 21.2R3-S9, * all versions of 21.4, * from 22.2 before 22.2R3-S6, * from 22.4 before 22.4R3-S5, * from 23.2 before 23.2R2-S3, * from 23.4 before 23.4R2-S4, * from 24.2 before 24.2R2; Junos OS Evolved: * All versions before 22.4R3-S5-EVO, * from 23.2-EVO before 23.2R2-S3-EVO, * from 23.4-EVO before 23.4R2-S4-EVO, * from 24.2-EVO before 24.2R2-EVO. This is a more complete fix for previously published CVE-2024-39549 (JSA83011).

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 8.7 HIGH

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M

CVSS 3.x Severity and Vector Strings:

CNA: Juniper Networks, Inc.

Base Score: 7.5 HIGH

Vector: CVSS:3.1/AV:N/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/JSA100050	Juniper Networks, Inc.	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	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 1/23/2026 2:36:05 PM

Action

Type

Old Value

New Value

Added

CPE Configuration

Record truncated, showing 2048 of 5677 characters.
View Entire Change Record

OR
          *cpe:2.3:o:juniper:junos:21.2:r1:*:*:*:*:*:*
          *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:21.2:r1-s2:*:*:*:*:*:*
          *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:21.2:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:* versions up to (excluding) 21.2
          *cpe:2.3:o:juniper:junos:22.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.2:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s4:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.2:r3-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s5:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:22.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:22.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:22.4:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:22.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:21.2:r3-s6:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22.4:r3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos_os_evolved:23.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:22

Added

Reference Type

Juniper Networks, Inc.: https://supportportal.juniper.net/JSA100050 Types: Vendor Advisory

New CVE Received from Juniper Networks, Inc. 7/11/2025 11:15:24 AM

Action	Type	New Value
Added	Description	A Use After Free vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an attacker sending a BGP update with a specifically malformed AS PATH to cause rpd to crash, resulting in a Denial of Service (DoS). Continuous receipt of the malformed AS PATH attribute will cause a sustained DoS condition. On all Junos OS and Junos OS Evolved platforms, the rpd process will crash and restart when a specifically malformed AS PATH is received within a BGP update and traceoptions are enabled. This issue only affects systems with BGP traceoptions enabled and requires a BGP session to be already established. Systems without BGP traceoptions enabled are not impacted by this issue. This issue affects: Junos OS: * All versions before 21.2R3-S9, * all versions of 21.4, * from 22.2 before 22.2R3-S6, * from 22.4 before 22.4R3-S5, * from 23.2 before 23.2R2-S3, * from 23.4 before 23.4R2-S4, * from 24.2 before 24.2R2; Junos OS Evolved: * All versions before 22.4R3-S5-EVO, * from 23.2-EVO before 23.2R2-S3-EVO, * from 23.4-EVO before 23.4R2-S4-EVO, * from 24.2-EVO before 24.2R2-EVO. This is a more complete fix for previously published CVE-2024-39549 (JSA83011).
Added	CVSS V4.0	AV:N/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:Y/R:A/V:C/RE:M/U:X
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added	CWE	CWE-416
Added	Reference	https://supportportal.juniper.net/JSA100050

Quick Info

CVE Dictionary Entry:
CVE-2025-52946
NVD Published Date:
07/11/2025
NVD Last Modified:
01/23/2026
Source:
Juniper Networks, Inc.

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