NVD / CVE Program· CNA juniper

CVE-2026-33788: Junos OS Evolved: Local, authenticated attacker can gain privileged access to FPCs

Noroxi assessment

Priority: Monitor (action score 34/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.11% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Juniper Networks Junos OS Evolved 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.2R3-S4-EVO.

Low priority for now. Upgrade to Juniper Networks Junos OS Evolved 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.2R3-S4-EVO or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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. This issue affects Junos OS Evolved on PTX10004, PTX10008, PTX100016, with JNP10K-LC1201 or JNP10K-LC1202: * All versions before 21.2R3-S8-EVO, * 21.4-EVO versions before 21.4R3-S7-EVO, * 22.2-EVO versions before 22.2R3-S4-EVO, * 22.3-EVO versions before 22.3R3-S3-EVO, * 22.4-EVO versions before 22.4R3-S2-EVO, * 23.2-EVO versions before 23.2R2-EVO.

HighCVSS 8.5 · v4.0—No exploit Fix available

Published: Apr 9, 2026
Updated: Oct 26, 2026
EPSS: 0.1% · 1th percentile
CWE: CWE-306

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 34 / 40 · 8.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · juniper: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
juniper	junos os evolved	cpe:2.3:o:juniper:junos_os_evolved
juniper	jnp10k-lc1201	cpe:2.3:h:juniper:jnp10k-lc1201
juniper	jnp10k-lc1202	cpe:2.3:h:juniper:jnp10k-lc1202
juniper	ptx100016	cpe:2.3:h:juniper:ptx100016
juniper	ptx10004	cpe:2.3:h:juniper:ptx10004
juniper	ptx10008	cpe:2.3:h:juniper:ptx10008

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

juniper junos os evolvedbefore 21.2
juniper junos os evolved21.2
juniper junos os evolved21.4
juniper junos os evolved22.2
juniper junos os evolved22.3
juniper junos os evolved22.4
juniper junos os evolved23.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (juniper). Independent of NVD's CPE analysis and usually ahead of it.

Juniper Networks Junos OS Evolved
- before 21.2R3-S8-EVOaffected · semver
- 21.4-EVO and later · before 21.4R3-S7-EVOaffected · semver
- 22.2-EVO and later · before 22.2R3-S4-EVOaffected · semver
- 22.3-EVO and later · before 22.3R3-S3-EVOaffected · semver
- 22.4-EVO and later · before 22.4R3-S2-EVOaffected · semver
- 23.2-EVO and later · before 23.2R2-EVOaffected · semver

Same product

juniper: all records

Other highest-scoring records for the same primary product.

CVE-2026-21902Junos OS Evolved: PTX Series: A vulnerability allows a unauthenticated, network-based attacker to execute code as root
43Plan
CVE-2026-101990Junos OS and Junos OS Evolved: A BGP peer causes an rpd crash when flow-spec routes are re-advertised
37Monitor
CVE-2026-101986Junos OS and Junos OS Evolved: J-Web permits pre-authentication CGI execution
37Monitor

Published before and after this one in the same product

← EarlierCVE-2025-59969Apr 9, 2026 · Junos OS Evolved: QFX5000 Series and PTX Series: An attacker sending crafted multicast packets will cause evo-aftmand / evo-pfemand to crash and restart
28Monitor
← EarlierCVE-2026-33783Apr 9, 2026 · Junos OS Evolved: PTX Series: If SRTE tunnels provisioned via PCEP are present and specific gRPC queries are received evo-aftmand crashes
28Monitor
Later →CVE-2026-33794Jul 9, 2026 · Junos OS Evolved: PTX Series: Receipt of repeated ECMP routing updates results in PFE crash
32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Juniper Networks Junos OS Evolved	21.2R3-S8-EVO	Vendor (CNA)
Juniper Networks Junos OS Evolved	21.4R3-S7-EVO	Vendor (CNA)
Juniper Networks Junos OS Evolved	22.2R3-S4-EVO	Vendor (CNA)
Juniper Networks Junos OS Evolved	22.3R3-S3-EVO	Vendor (CNA)
Juniper Networks Junos OS Evolved	22.4R3-S2-EVO	Vendor (CNA)
Juniper Networks Junos OS Evolved	23.2R2-EVO	Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: X

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X

nvd-secondary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1// Added for the support team
2app.post("/maintenance/reset", resetDevice);

Fixed

1if (config.maintenanceEnabled) {
2  app.post(
3    "/maintenance/reset",
4    requireSession, requireRole("admin"), resetDevice
5  );
6}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

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References

kb.juniper.net/JSA107806

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records