NVD

CVE-2026-21916 Detail

Description

A UNIX Symbolic Link (Symlink) Following vulnerability in the CLI of Juniper Networks Junos OS allows a local, authenticated attacker with low privileges to escalate their privileges to root which will lead to a complete compromise of the system. When after a user has performed a specific 'file link ...' CLI operation, another user commits (unrelated configuration changes), the first user can login as root. This issue affects Junos OS: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S6, * 24.2 versions before 24.2R2-S3, * 24.4 versions before 24.4R2-S2, * 25.2 versions before 25.2R2. This issue does not affect versions 25.4R1 or later.

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 7.0 HIGH

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

CVSS 3.x Severity and Vector Strings:

CNA: Juniper Networks, Inc.

Base Score: 7.3 HIGH

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/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://kb.juniper.net/JSA107807	Juniper Networks, Inc.	Mitigation Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-61	UNIX Symbolic Link (Symlink) Following	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 4/17/2026 2:05:52 PM

Action

Type

Old Value

New Value

Added

CPE Configuration

Record truncated, showing 2048 of 2242 characters.
View Entire Change Record

OR
          *cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2-s3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r2-s3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.2:r2-s4:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2-s4:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.4:r1-s3:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:23.4:r2-s5:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.2:r2-s2:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:24.4:r2-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:*
          *cpe:2.3:o:juniper:junos:25.2:r1-s2:*:*:*:*:*:*

Added

Reference Type

Juniper Networks, Inc.: https://kb.juniper.net/JSA107807 Types: Mitigation, Vendor Advisory

New CVE Received from Juniper Networks, Inc. 4/09/2026 6:16:24 PM

Action	Type	New Value
Added	Description	A UNIX Symbolic Link (Symlink) Following vulnerability in the CLI of Juniper Networks Junos OS allows a local, authenticated attacker with low privileges to escalate their privileges to root which will lead to a complete compromise of the system. When after a user has performed a specific 'file link ...' CLI operation, another user commits (unrelated configuration changes), the first user can login as root. This issue affects Junos OS: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S6, * 24.2 versions before 24.2R2-S3, * 24.4 versions before 24.4R2-S2, * 25.2 versions before 25.2R2. This issue does not affect versions 25.4R1 or later.
Added	CVSS V4.0	AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/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:U/V:X/RE:M/U:X
Added	CVSS V3.1	AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Added	CWE	CWE-61
Added	Reference	https://kb.juniper.net/JSA107807

Quick Info

CVE Dictionary Entry:
CVE-2026-21916
NVD Published Date:
04/09/2026
NVD Last Modified:
04/17/2026
Source:
Juniper Networks, Inc.

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National Vulnerability Database