Vulnerability · Published Oct 9, 2025 · Assigned by juniper

CVE-2025-59980Junos OS: When a user with the name ftp or anonymous is configured unauthenticated filesystem access is allowed

Medium 6.5

In plain English

A medium-severity security flaw in Junos OS from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 78.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Juniper Networks	Junos OS	0 – before 22.4R3-S823.2 – before 23.2R2-S323.4 – before 23.4R2

Weakness: CWE-305 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References

https://supportportal.juniper.net/JSA103167 vendor-advisory