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CVE-2024-39522: Junos OS Evolved: CLI parameter processing issue allows privilege escalation

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-11 · updated 2026-06-17
• Weakness: CWE-78

Description

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: * 22.3-EVO versions before 22.3R2-EVO, * 22.4-EVO versions before 22.4R1-S1-EVO, 22.4R2-EVO.

Affected products

• Juniper Networks Junos OS Evolved: 22.3, 22.3-r1, 22.3-r1-s1, 22.3-r1-s2, 22.4, 22.4-r1

References

• https://supportportal.juniper.net/JSA82975
• https://supportportal.juniper.net/JSA82975

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