CVE-2021-0248

Name: CVE-2021-0248
Creator: NVD / NIST
Published: 2021-04-22T20:15:09.257+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 1.03%

Last modified Jun 17, 2026

CVE-2021-0248 is a critical-severity vulnerability rated 10/10 on the CVSS scale. This issue is not applicable to NFX NextGen Software. On NFX Series devices the use of Hard-coded Credentials in Juniper Networks Junos OS allows an attacker to take over any instance of an NFX deployment. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

Description

This issue is not applicable to NFX NextGen Software. On NFX Series devices the use of Hard-coded Credentials in Juniper Networks Junos OS allows an attacker to take over any instance of an NFX deployment. This issue is only exploitable through administrative interfaces. This issue affects: Juniper Networks Junos OS versions prior to 19.1R1 on NFX Series. No other platforms besides NFX Series devices are affected.

Metrics

CVSS 3.1

10/10

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

EPSS Probability

1.03%

59.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Juniper	Junos	< 19.1
Juniper	Junos	19.1

References

https://kb.juniper.net/JSA11141Vendor Advisory
https://kb.juniper.net/JSA11141Vendor Advisory

Timeline

Published: Apr 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-0248?

How severe is CVE-2021-0248?

CVE-2021-0248 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.

How do I fix CVE-2021-0248?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-0248?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST