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CVE-2026-21916— Junos OS: A low privileged user can escalate their privileges so that they can login as root

Quick assessment

Affected
Juniper Networks Junos OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS 23.2R2-S7之前版本、23.4R2-S6之前的23.4版本、24.2R2-S3之前的24.2版本、24.4R2-S2之前的24.4版本和25.2R2之前的25.2版本存在安全漏洞，该漏洞源于UNIX符号链接跟随问题，可能导致本地低权限认证攻击者提升权限

CVSS 7.3 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-21916

Vulnerability Information
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Vulnerability Title
Junos OS: A low privileged user can escalate their privileges so that they can login as root
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS是美国瞻博网络（Juniper Networks）公司的一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。 Juniper Networks Junos OS 23.2R2-S7之前版本、23.4R2-S6之前的23.4版本、24.2R2-S3之前的24.2版本、24.4R2-S2之前的24.4版本和25.2R2之前的25.2版本存在安全漏洞，该漏洞源于UNIX符号链接跟随问题，可能导致本地低权限认证攻击者提升权限
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos OS 0 ~ 23.2R2-S7 -

II. Public POCs for CVE-2026-21916

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III. Intelligence Information for CVE-2026-21916

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Same Patch Batch · Juniper Networks · 2026-04-09 · 26 CVEs total

CVE-2026-33784 9.8 CRITICAL JSI Virtual Lightweight Collector: Default password is not required to be changed which al
CVE-2026-33785 8.8 HIGH Junos OS: MX Series: Missing Authorization for specific 'request' CLI commands in a JDM/CS
CVE-2025-13914 8.7 HIGH Apstra: SSH host key validation vulnerability for managed devices
CVE-2026-33793 7.8 HIGH Junos OS and Junos OS Evolved: When an unsigned Python op script configuration is present,
CVE-2026-33788 7.8 HIGH Junos OS Evolved: Local, authenticated attacker can gain privileged access to FPCs
CVE-2026-33790 7.5 HIGH Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 pa
CVE-2026-33778 7.5 HIGH Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is rece
CVE-2026-33771 7.4 HIGH CTP OS: Configuring password requirements does not work which permits the use of weak pass
CVE-2026-33797 7.4 HIGH Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a
CVE-2026-33791 6.7 MEDIUM Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shel
CVE-2026-21915 6.7 MEDIUM JSI Virtual Lightweight Collector: Shell escape allows privilege escalation to root
CVE-2026-33780 6.5 MEDIUM Junos OS and Junos OS Evolved: In an EVPN-MPLS scenario churn of ESI routes causes a memor
CVE-2025-59969 6.5 MEDIUM Junos OS Evolved: QFX5000 Series and PTX Series: An attacker sending crafted multicast pac
CVE-2026-21919 6.5 MEDIUM Junos OS and Junos OS Evolved: A high frequency of connecting and disconnecting NETCONF se
CVE-2026-33781 6.5 MEDIUM Junos OS: EX Series, QFX Series: In a VXLAN scenario when specific control protocol packet
CVE-2026-33782 6.5 MEDIUM Junos OS: MX Series: In specific DHCPv6 scenarios jdhcpd memory increases continuously wit
CVE-2026-33775 6.5 MEDIUM Junos OS: MX Series: Mismatch between configured and received packet types causes memory l
CVE-2026-33779 6.5 MEDIUM Junos OS: SRX Series: Insufficient certificate verification for device to SD cloud communi
CVE-2026-33783 6.5 MEDIUM Junos OS Evolved: PTX Series: If SRTE tunnels provisioned via PCEP are present and specifi
CVE-2026-33774 6.5 MEDIUM Junos OS: MX Series: Firewall filters on lo0.<non-0> in the default routing instance are n

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-61

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