CVE-2024-39523

Junos OS Evolved: CLI parameter processing issue allows privilege escalation

HIGH

7.8

CVSS Score

Published: July 11, 2024 at 04:00 PM UTC

Updated: June 17, 2026 at 07:42 AM UTC

2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity

HIGH7.8

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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: * All versions before 20.4R3-S7-EVO, * 21.2-EVO versions 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, * 22.4-EVO versions before 22.4R2-EVO.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved · Juniper

95%

v < 20.4v < 20.4r3-s721.2 ≤ v < 21.2r3-s821.4 ≤ v < 21.4r3-s722.1 ≤ v < 22.1r3-s622.2 ≤ v < 22.2r322.3 ≤ v < 22.3r222.4 ≤ v < 22.4r220.4 20.4 r1 20.4 r1-s1 20.4 r1-s2 20.4 r2 20.4 r2-s1 20.4 r2-s2 20.4 r2-s3 20.4 r3 20.4 r3-s1 20.4 r3-s2 20.4 r3-s3 20.4 r3-s4 20.4 r3-s5 20.4 r3-s6 21.2 21.2 r1 21.2 r1-s1 21.2 r1-s2 21.2 r2 21.2 r2-s1 21.2 r2-s2 21.2 r3 21.2 r3-s1 21.2 r3-s2 21.2 r3-s3 21.2 r3-s4 21.2 r3-s5 21.2 r3-s6 21.2 r3-s7 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 21.4 r2 21.4 r2-s1 21.4 r2-s2 21.4 r3 21.4 r3-s1 21.4 r3-s2 21.4 r3-s3 21.4 r3-s4 21.4 r3-s5 21.4 r3-s6 22.1 22.2 22.2 r1 22.2 r1-s1 22.2 r2 22.2 r2-s2 22.3 22.3 r1 22.3 r1-s1 22.3 r1-s2 22.4 22.4 r1 22.4 r1-s1 22.4 r1-s2

Affected range stops below 20.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.4r3-s7, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2r3-s8, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4r3-s7, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1r3-s6, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2r3, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3r2, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4r2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

v < 20.4R3-S7-EVO21.2-EVO ≤ v < 21.2R3-S8-EVO21.4-EVO ≤ v < 21.4R3-S7-EVO22.1-EVO ≤ v < 22.1R3-S6-EVO22.2-EVO ≤ v < 22.2R3-EVO22.3-EVO ≤ v < 22.3R2-EVO22.4-EVO ≤ v < 22.4R2-EVO21.2-EVO 21.4-EVO 22.1-EVO 22.2-EVO 22.3-EVO 22.4-EVO

Affected range stops below 20.4R3-S7-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R3-S8-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R3-S7-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R3-S6-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.3R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.4R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://supportportal.juniper.net/JSA82975

References (1)

Vendor Advisory

Source: [email protected]

https://supportportal.juniper.net/JSA82975

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHjuniper

Attack Vector: LOCAL
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-78

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