CVE-2024-39521highCWE-78

CVE-2024-39521: high-severity vulnerability in Juniper Networks Junos OS Evolved

Junos OS Evolved: CLI parameter processing issue allows privilege escalation

Published · Updated

Follow this CVE+ Monitor Junos OS Evolved

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.5epss 0.3%
An Improper Neutralization of Special Elements vulnerability in Juniper Networks Junos OS Evolved commands allows a local, authenticated attacker with low privileges to escalate their privileges to 'root' leading to a full compromise of the system. The Junos OS Evolved CLI doesn't properly handle command options in some cases, allowing users which execute specific CLI commands with a crafted set of parameters to escalate their privileges to root on shell level. This issue affects Junos OS Evolved:  * 21.1-EVO versions 21.1R1-EVO and later before 21.2R3-S8-EVO,  * 21.4-EVO versions before 21.4R3-S7-EVO, * 22.1-EVO versions before 22.1R3-S6-EVO,  * 22.2-EVO versions before 22.2R3-EVO, * 22.3-EVO versions before 22.3R2-EVO.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
Juniper Networks · Junos OS Evolved
Related CVEs — Juniper Networks Junos OS Evolved

In the same product, most dangerous first.

CVE-2026-21902CRITICALJunos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as rootEPSS 18.5%CVE-2026-101967CRITICALJunos OS Evolved: PTX Series: An attacker controlled DHCP response causes root-level compromise when zero-touch provisioning is usedEPSS 3.9%CVE-2026-101978HIGHJunos OS Evolved: PTX Series: An attacker controlled gRPC response causes root-level compromise when zero-touch provisioning is usedEPSS 3.9%CVE-2026-102059HIGHJunos OS and Junos OS Evolved: EX Series, SRX Series, QFX Series: A rogue DHCP server causes root-level command execution when the phone-home client processes specific informationEPSS 3.9%CVE-2026-102031CRITICALJunos OS Evolved: A low-privileged TACACS+ user causes root command execution when authorization refresh is enabledEPSS 2.1%CVE-2023-28983HIGHJunos OS Evolved: Shell Injection vulnerability in the gNOI serverEPSS 1.5%