Improper Check for Unusual or Exceptional Conditions in Junos OS and Junos OS Evolved - CVE-2025-59960
Published: January 19, 2026
Vulnerability identifier: #VU121667
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-59960
CWE-ID: CWE-754
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to crash the entire system.
The vulnerability exists due to improper check for unusual or exceptional conditions error in the Juniper DHCP service (jdhcpd). A remote non-authenticated attacker can exhaust the address pools of other subnets, leading to a Denial of Service (DoS) on the downstream DHCP server.
Affected software
Junos OS
Junos OS Evolved
Junos OS Evolved
How to mitigate CVE-2025-59960
Install updates from vendor's website.
Junos OS - addressed in versions 21.2R3-S10, 21.4R3-S12, 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S2, 24.4R2, 25.2R1-S1, 25.2R2, 25.4R1
Junos OS Evolved - addressed in versions 21.4R3-S12-EVO, 22.4R3-S8-EVO, 23.2R2-S5-EVO, 23.4R2-S6-EVO, 24.2R2-S2-EVO, 24.4R2-EVO, 25.2R1-S1-EVO, 25.2R2-EVO, 25.4R1-EVO
Junos OS Evolved - addressed in versions 21.4R3-S12-EVO, 22.4R3-S8-EVO, 23.2R2-S5-EVO, 23.4R2-S6-EVO, 24.2R2-S2-EVO, 24.4R2-EVO, 25.2R1-S1-EVO, 25.2R2-EVO, 25.4R1-EVO