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NVD / CVE Program· CNA juniper

CVE-2026-33793: Junos OS and Junos OS Evolved: When an unsigned Python op script configuration is present, a local low privileged user can compromise the system

HighCVSS 8.5 · v4.0—No exploit Fix available

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: 0.16% (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 22.4R3-S7, 23.2R2-S4, 23.4R2-S6; Juniper Networks Junos OS Evolved 22.4R3-S7-EVO, 23.2R2-S4-EVO, 23.4R2-S6-EVO.

Low priority for now. Upgrade to Juniper Networks Junos OS 22.4R3-S7, 23.2R2-S4, 23.4R2-S6; Juniper Networks Junos OS Evolved 22.4R3-S7-EVO, 23.2R2-S4-EVO, 23.4R2-S6-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

An Execution with Unnecessary Privileges vulnerability in the User Interface (UI) of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privileged attacker to gain root privileges, thus compromising the system. When a configuration that allows unsigned Python op scripts is present on the device, a non-root user is able to execute malicious op scripts as a root-equivalent user, leading to privilege escalation.  This issue affects Junos OS:  * All versions before 22.4R3-S7,  * from 23.2 before 23.2R2-S4,  * from 23.4 before 23.4R2-S6, * from 24.2 before 24.2R1-S2, 24.2R2,  * from 24.4 before 24.4R1-S2, 24.4R2;  Junos OS Evolved:  * All versions before 22.4R3-S7-EVO,  * from 23.2 before 23.2R2-S4-EVO,  * from 23.4 before 23.4R2-S6-EVO, * from 24.2 before 24.2R2-EVO,  * from 24.4 before 24.4R1-S1-EVO, 24.4R2-EVO.

Published
Apr 9, 2026
Updated
Oct 26, 2026
EPSS
0.1% · 5th percentile

Report tools

JSON

Action score

34

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.

Follow CVE-2026-33793

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
juniperjunos
juniperjunos os evolved

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

    • before 22.4R3-S7affected · semver
    • 23.2 and later · before 23.2R2-S4affected · semver
    • 23.4 and later · before 23.4R2-S6affected · semver
    • 24.2 and later · before 24.2R1-S2, 24.2R2affected · semver
    • 24.4 and later · before 24.4R1-S2, 24.4R2affected · semver

  • Juniper Networks Junos OS Evolved

    • before 22.4R3-S7-EVOaffected · semver
    • 23.2 and later · before 23.2R2-S4-EVOaffected · semver
    • 23.4 and later · before 23.4R2-S6-EVOaffected · semver
    • 24.2 and later · before 24.2R2-EVOaffected · semver
    • 24.4 and later · before 24.4R1-S1-EVO, 24.4R2-EVOaffected · semver
Affected versions · NVD (12)

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

  • juniper junosbefore 22.4
  • juniper junos22.4
  • juniper junos23.2
  • juniper junos23.4
  • juniper junos24.2
  • juniper junos24.4
  • juniper junos os evolvedbefore 22.4
  • juniper junos os evolved22.4
  • juniper junos os evolved23.2
  • juniper junos os evolved23.4
  • juniper junos os evolved24.2
  • juniper junos os evolved24.4

Same product

juniper: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-36845Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to control an important environment variableKEV
    98Now
  • CVE-2023-36846Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary filesKEV
    79This week
  • CVE-2023-36844Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variablesKEV
    78This week

Published before and after this one in the same product

  • ← EarlierCVE-2026-33790Apr 9, 2026 · Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 packet will cause the srxpfe process to crash and restart.
    34Monitor
  • ← EarlierCVE-2026-33791Apr 9, 2026 · Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shell injection as root
    33Monitor
  • Later →CVE-2026-33797Apr 9, 2026 · Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a BGP reset
    28Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
Juniper Networks Junos OS22.4R3-S7Vendor (CNA)
Juniper Networks Junos OS23.2R2-S4Vendor (CNA)
Juniper Networks Junos OS23.4R2-S6Vendor (CNA)
Juniper Networks Junos OS24.2R1-S2, 24.2R2Vendor (CNA)
Juniper Networks Junos OS24.4R1-S2, 24.4R2Vendor (CNA)
Juniper Networks Junos OS Evolved22.4R3-S7-EVOVendor (CNA)
Juniper Networks Junos OS Evolved23.2R2-S4-EVOVendor (CNA)
Juniper Networks Junos OS Evolved23.4R2-S6-EVOVendor (CNA)
Juniper Networks Junos OS Evolved24.2R2-EVOVendor (CNA)
Juniper Networks Junos OS Evolved24.4R1-S1-EVO, 24.4R2-EVOVendor (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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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-250 · Execution with Unnecessary Privileges

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:C/RE:M/U:Amber

nvd-secondary

Attack context

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

ATT&CK techniques

—

References

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

All records