CVE-2021-0246

Cross-tenant traffic exposure via excessive default permissions

Published Apr 22, 2021 · Updated Sep 17, 2024

Incorrect default permissions in Juniper Networks Junos OS allow local users with tenant administrator privileges to redirect cross-tenant traffic. The tenant administrator role receives permissions that allow device-wide traffic-management changes instead of restricting control to its tenant. The issue requires tenant services on specified SRX devices with SPC2 or SPC3; traffic can reach other tenants or expose their traffic.

CVSS severity7.3
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect default permissions in Juniper Networks Junos OS allow local users with tenant administrator privileges to redirect cross-tenant traffic. The tenant administrator role receives permissions that allow device-wide traffic-management changes instead of restricting control to its tenant. The issue requires tenant services on specified SRX devices with SPC2 or SPC3; traffic can reach other tenants or expose their traffic.

The record

CVE
CVE-2021-0246
Published
Apr 22, 2021
Updated
Sep 17, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-276, T1040
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=18.3R1 <18.3* changes=[{"at":"18.3R3","status":"unaffected"}]
  2. Affected versionversion=18.4 <18.4R2
  3. Affected versionversion=19.1 <19.1R2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Juniper Networks · Junos OSversion=18.3R1 <18.3* changes=[{"at":"18.3R3","status":"unaffected"}]; version=18.4 <18.4R2; version=19.1 <19.1R2

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.3Juniper Networks, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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