What is CVE-2025-21591?

CVE-2025-21591 is a high-severity vulnerability in Juniper Networks Junos Os, classified under Buffer Access with Incorrect Length Value. CVSS score: 7.4/10. Published 2025-04-09.

How severe is CVE-2025-21591?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Juniper Networks Junos Os

CVE-2025-21591

A Buffer Access with Incorrect Length Value vulnerability in the jdhcpd daemon of Juniper Networks Junos OS, when DHCP snooping is enabled, allows an unauthenticated, adjacent, attacker to send a DHCP packet with a malformed DHCP option to…

EPSS: 0.001 (22.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Juniper Networks Junos Os — versions 23.1, 23.4, 24.2

Weakness classification (CWE)

CWE-805 — Buffer Access with Incorrect Length Value

References

supportportal.juniper.net/JSA96448 (vendor-advisory)

Frequently asked questions

What is CVE-2025-21591?: CVE-2025-21591 is a high-severity vulnerability in Juniper Networks Junos Os, classified under Buffer Access with Incorrect Length Value. CVSS score: 7.4/10. Published 2025-04-09.
How severe is CVE-2025-21591?: High severity. CVSS v3 base score is 7.4 out of 10.