What is CVE-2025-59957?

CVE-2025-59957 is a medium-severity vulnerability in Juniper Ex4600, classified under Origin Validation Error. CVSS score: 6.8/10. Published 2025-10-09.

How severe is CVE-2025-59957?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Juniper Ex4600

CVE-2025-59957

An Origin Validation Error vulnerability in an insufficient protected file of Juniper Networks Junos OS on EX4600 Series and QFX5000 Series allows an unauthenticated attacker with physical access to the device to create a backdoor which al…

EPSS: 0.002 (6.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

sirt@juniper.net (vendor-advisory, Vendor Advisory)
sirt@juniper.net (Technical Description, technical-description)
sirt@juniper.net (technical-description, Vendor Advisory)

Frequently asked questions

What is CVE-2025-59957?: CVE-2025-59957 is a medium-severity vulnerability in Juniper Ex4600, classified under Origin Validation Error. CVSS score: 6.8/10. Published 2025-10-09.
How severe is CVE-2025-59957?: Medium severity. CVSS v3 base score is 6.8 out of 10.