An Out-of-bounds Write vulnerability in libfetch used in Juniper Networks Junos OS Evolved has been resolved by updating third-party software. Exploitation of these vulnerabilities allows a local, low-privileged user exploiting URL handling in libfetch with URLs containing username and/or password components to cause a heap buffer overflow, triggering program misbehavior or malicious code execution.

This issue affects Junos OS Evolved:

• all versions before 22.4R3-S9-EVO;
• from 23.2 before 23.2R2-S5-EVO;
• from 23.4 before 23.4R2-S8-EVO;
• from 24.2 before 24.2R2-S3-EVO;
• from 24.4 before 24.4R2-EVO;
• from 25.2 before 25.2R1-S1-EVO, 25.2R2-EVO.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was discovered by a third-party upstream provider.

This issue has been assigned CVE-2020-7450.

The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 22.4R3-S9-EVO, 23.2R2-S5-EVO, 23.4R2-S8-EVO, 24.2R2-S3-EVO, 24.4R2-EVO, 25.2R1-S1-EVO, 25.2R2-EVO, 25.4R1-EVO, and all subsequent releases.

This issue is being tracked as 1885384 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Use access lists or firewall filters to limit access to the device via CLI only from trusted hosts and administrators.

2026-07-08: Initial Publication

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team