CVE-2024-39521

Root escalation via crafted CLI command options

Published Jul 11, 2024 · Updated Aug 2, 2024

OS command injection in the Junos OS Evolved CLI allows local users with low privileges to escalate to root via crafted command options. The CLI fails to neutralize special elements in options supplied to certain commands, but Juniper has not identified the commands or parsing path. An authenticated user with low CLI privileges can obtain root shell access and fully control the device.

CVSS severity8.5
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in the Junos OS Evolved CLI allows local users with low privileges to escalate to root via crafted command options. The CLI fails to neutralize special elements in options supplied to certain commands, but Juniper has not identified the commands or parsing path. An authenticated user with low CLI privileges can obtain root shell access and fully control the device.

The record

CVE
CVE-2024-39521
Published
Jul 11, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-78, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=21.1 <21.2r3-s8
  2. Affected versionversion=21.1-EVO <21.2R3-S8-EVO
  3. Affected versionversion=21.4 <21.4r3-s7
  4. Affected versionversion=21.4-EVO <21.4R3-S7-EVO
  5. Affected versionversion=22.1 <22.1r3-s6
  6. Affected versionversion=22.1-EVO <22.1R3-S6-EVO
  7. Affected versionversion=22.2 <22.2r3
  8. Affected versionversion=22.2-EVO <22.2R3-EVO
  9. Affected versionversion=22.3 <22.3r2
  10. Affected versionversion=22.3-EVO <22.3R2-EVO

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.1 <21.2r3-s8; version=21.1-EVO <21.2R3-S8-EVO; version=21.4 <21.4r3-s7; version=21.4-EVO <21.4R3-S7-EVO; version=22.1 <22.1r3-s6; version=22.1-EVO <22.1R3-S6-EVO; version=22.2 <22.2r3; version=22.2-EVO <22.2R3-EVO; version=22.3 <22.3r2; version=22.3-EVO <22.3R2-EVO

Published CVSS scores

8.5Juniper Networks, Inc.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
7.8Juniper Networks, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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