SB2026011997 - Improper Check for Unusual or Exceptional Conditions in Junos OS Evolved and Juniper Junos OS
Published: January 19, 2026
Security Bulletin ID
SB2026011997
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2025-59960)
CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions
CVSSv4: 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/E:U/U:Green
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.
Remediation
Install update from vendor's website.