Description
An Authentication Bypass by Primary Weakness
in the FTP server of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to get limited read-write access to files on the device.
When the FTP server is enabled and a user named "ftp" or "anonymous" is configured, that user can login without providing the configured password and then has read-write access to their home directory.
This issue affects Junos OS:
* all versions before 22.4R3-S8,
* 23.2 versions before 23.2R2-S3,
* 23.4 versions before 23.4R2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Juniper Networks | Junos OS | < 22.4R3-S8, 23.2 – < 23.2R2-S3, 23.4 – < 23.4R2 | 22.4R3-S8 |
Advisories 2
- NCSC-2025-0305 Kwetsbaarheden verholpen in Juniper Networks Junos OS NCSC-NL (Netherlands) · Oct 13, 2025
- WID-SEC-2025-2238 Juniper JUNOS OS, Space, OS Evolved: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 9, 2025
References
- https://supportportal.juniper.net/JSA103167 vendor-advisory