Buffer access with incorrect length value in Junos OS - CVE-2025-21591
Published: April 14, 2025
Vulnerability identifier: #VU107437
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-21591
CWE-ID:
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to a crash the entire system.
The vulnerability exists due to buffer access with incorrect length value error in the jdhcpd daemon. A remote non-authenticated attacker can send a DHCP packet with a malformed DHCP option to cause jdhcp to crash creating a Denial of Service (DoS) condition.
Affected software
Junos OS
How to mitigate CVE-2025-21591
Install updates from vendor's website.
Junos OS - addressed in versions 23.2R2-S3, 23.4R2-S3, 24.2R2, 24.4R1