CVE-2021-0231

Name: CVE-2021-0231
Creator: NVD / NIST
Published: 2021-04-22T20:15:08.673+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.23%

Last modified Jun 17, 2026

CVE-2021-0231 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A path traversal vulnerability in the Juniper Networks SRX and vSRX Series may allow an authenticated J-web user to read sensitive system files. This issue affects Juniper Networks Junos OS on SRX and vSRX Series: 19.3 versions prior to 19.3R2-S6, 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3; 20.1 versions prior to 20.1R1-S4, 20.1R2; 20.2 versions prior to 20.2R1-S3, 20.2R2; This issue does not affect Juniper Networks Junos OS versions prior to 19.3R1.. EPSS estimates a 1.23% chance of exploitation in the next 30 days.

Description

A path traversal vulnerability in the Juniper Networks SRX and vSRX Series may allow an authenticated J-web user to read sensitive system files. This issue affects Juniper Networks Junos OS on SRX and vSRX Series: 19.3 versions prior to 19.3R2-S6, 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3; 20.1 versions prior to 20.1R1-S4, 20.1R2; 20.2 versions prior to 20.2R1-S3, 20.2R2; This issue does not affect Juniper Networks Junos OS versions prior to 19.3R1.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.23%

65.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Juniper	Junos	19.3	—
Juniper	Junos	19.4	R1
Juniper	Junos	20.1	R1
Juniper	Junos	20.2	R1

References

https://kb.juniper.net/JSA11126Vendor Advisory
https://kb.juniper.net/JSA11126Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-0231?

How severe is CVE-2021-0231?

CVE-2021-0231 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.23% probability of exploitation in the next 30 days.

How do I fix CVE-2021-0231?

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-2021-0231?

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

Scan your code now

Source: NVD / NIST