CVE-2026-33788: A Missing Authentication for Critical Function vulnerability in the Flexible PIC Concentrators (FPCs) of Junip

Q: How do I fix CVE-2026-33788?

junos os evolved: upgrade to 21.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-33788 being exploited?

CVE-2026-33788 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-2026-33788 affect?

CVE-2026-33788 affects junos os evolved. Severity is high (CVSS 7.8). A Missing Authentication for Critical Function vulnerability in the Flexible PIC Concentrators (FPCs) of Juniper Networks Junos OS Evolved on PTX Series allows a local, authenticated attacker with low privileges to gain direct access to FPC

Routine

HIGH 7.8UPGRADE

CVE-2026-33788 is a high-severity flaw (CVSS 7.8) affecting junos os evolved. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Missing Authentication for Critical Function vulnerability in the Flexible PIC Concentrators (FPCs) of Juniper Networks Junos OS Evolved on PTX Series allows a local, authenticated attacker with low privileges to gain direct access to FPCs installed in the device. A local user with low privileges can gain direct access to the installed FPCs as a high privileged user, which can potentially lead to a full compromise of the affected component. T

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-306
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 21:10 UTCUpdated Record last modified

juniper junos os evolved UPGRADE

Affected: < 21.2 · 21.2 · 21.2 r1 · 21.2 r1-s1 · 21.2 r1-s2 · 21.2 r2 · 21.2 r2-s1 · 21.2 r2-s2

Fixed in: 21.2

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-2026-33788?

junos os evolved: upgrade to 21.2. Exact commands for each OS are on this page.

Is CVE-2026-33788 being exploited?

CVE-2026-33788 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-2026-33788 affect?

CVE-2026-33788 affects junos os evolved. Severity is high (CVSS 7.8). A Missing Authentication for Critical Function vulnerability in the Flexible PIC Concentrators (FPCs) of Juniper Networks Junos OS Evolved on PTX Series allows a local, authenticated attacker with low privileges to gain direct access to FPC

How urgent is CVE-2026-33788?

Priority 28/100. High severity

Software pages

Juniper Junos vulnerabilities

Related CVEs

CVE-2026-33791 MEDIUM 6.7 UPGRADE UPGRADE An OS Command Injection vulnerability in the CLI processing of Juniper Networks Junos OS and Junos OS Evolved
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-2026-33797 HIGH 7.4 MITIGATE MITIGATE An Improper Input Validation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an unauthe
CVE-2026-33783 MEDIUM 6.5 UPGRADE A Function Call With Incorrect Argument Type vulnerability in the sensor interface of Juniper Networks Junos O
CVE-2026-33780 MEDIUM 6.5 UPGRADE UPGRADE A Missing Release of Memory after Effective Lifetime vulnerability in the Layer 2 Address Learning Daemon (l2a

References

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