What is CVE-2025-21597?

CVE-2025-21597 is a medium-severity vulnerability in Juniper Junos, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.3/10. Published 2025-04-09.

How severe is CVE-2025-21597?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Juniper Junos

CVE-2025-21597

An Improper Check for Unusual or Exceptional Conditions vulnerability in routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, logically adjacent BGP peer to cause Denial of Service (DoS…

EPSS: 0.002 (12.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Juniper Junos — versions 20.4, 21.2, 21.3
Juniper Junos_os_evolved — versions 21.2, 21.3, 21.4
Juniper Networks Junos Os — versions 0, 21.2, 21.3
Juniper Networks Junos Os Evolved — versions 0, 21.3-EVO, 21.4-EVO

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

sirt@juniper.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-21597?: CVE-2025-21597 is a medium-severity vulnerability in Juniper Junos, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.3/10. Published 2025-04-09.
How severe is CVE-2025-21597?: Medium severity. CVSS v3 base score is 5.3 out of 10.