CVE-2026-33791: An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved

Q: How do I fix CVE-2026-33791?

junos: upgrade to 22.4; junos os evolved: upgrade to 22.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-33791 being exploited?

CVE-2026-33791 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33791 affect?

CVE-2026-33791 affects junos, junos os evolved. Severity is medium (CVSS 6.7). An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker executing specific, crafted CLI commands to inject arbitrary shell commands as root, lead

Q: How urgent is CVE-2026-33791?

Priority 37/100. No elevated risk signals yet.

Routine

MEDIUM 6.7UPGRADEUPGRADE

CVE-2026-33791 is a medium-severity flaw (CVSS 6.7) affecting junos, junos os evolved. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker executing specific, crafted CLI commands to inject arbitrary shell commands as root, leading to a complete compromise of the system. Certain 'set system' commands, when executed with crafted arguments, are not properly sanitized, allowing for arbitrary shell injection. These shell commands are exe

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): Juniper Networks, Inc. · Vendor: juniper

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 22:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

juniper junos UPGRADE

Affected: < 22.4 · 22.4 · 22.4 r1 · 22.4 r1-s1 · 22.4 r1-s2 · 22.4 r2 · 22.4 r2-s1 · 22.4 r2-s2

Fixed in: 22.4

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

juniper junos os evolved UPGRADE

Affected: < 22.4 · 22.4 · 22.4 r1 · 22.4 r1-s1 · 22.4 r1-s2 · 22.4 r2 · 22.4 r2-s1 · 22.4 r2-s2

Fixed in: 22.4

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33791?

junos: upgrade to 22.4; junos os evolved: upgrade to 22.4. Exact commands for each OS are on this page.

Is CVE-2026-33791 being exploited?

CVE-2026-33791 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33791 affect?

CVE-2026-33791 affects junos, junos os evolved. Severity is medium (CVSS 6.7). An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker executing specific, crafted CLI commands to inject arbitrary shell commands as root, lead

How urgent is CVE-2026-33791?

Priority 37/100. No elevated risk signals yet.

Software pages

Juniper Junos vulnerabilities

Related CVEs

CVE-2026-33790 HIGH 7.5 UPGRADE An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Ne
CVE-2026-33785 HIGH 8.8 MITIGATE A Missing Authorization vulnerability in the CLI of Juniper Networks Junos OS on MX Series allows a local, aut
CVE-2026-33793 HIGH 7.8 UPGRADE UPGRADE An Execution with Unnecessary Privileges vulnerability in the User Interface (UI) of Juniper Networks Junos OS
CVE-2026-33773 MEDIUM 5.8 MITIGATE An Incorrect Initialization of Resource vulnerability in the packet forwarding engine (pfe) of Juniper Network
CVE-2026-33779 MEDIUM 6.5 UPGRADE An Improper Following of a Certificate's Chain of Trust vulnerability in J-Web of Juniper Networks Junos OS on

References

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