EUVD-2026-21091
GHSA-rpvg-7w65-9g7p
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:M/U:X
Lifecycle Timeline
7DescriptionNVD
A Missing Release of Memory after Effective Lifetime vulnerability in the DHCP daemon (jdhcpd) of Juniper Networks Junos OS on MX Series, allows an adjacent, unauthenticated attacker to cause a memory leak, that will eventually cause a complete Denial-of-Service (DoS).
In a DHCPv6 over PPPoE, or DHCPv6 over VLAN with Active lease query or Bulk lease query scenario, every subscriber logout will leak a small amount of memory. When all available memory has been exhausted, jdhcpd will crash and restart which causes a complete service impact until the process has recovered.
The memory usage of jdhcpd can be monitored with:
user@host> show system processes extensive | match jdhcpd
This issue affects Junos OS:
- all versions before 22.4R3-S1,
- 23.2 versions before 23.2R2,
- 23.4 versions before 23.4R2.
AnalysisAI
Memory leak in Juniper Networks Junos OS jdhcpd daemon enables adjacent unauthenticated attackers to crash DHCP services on MX Series routers. Each DHCPv6 subscriber logout in PPPoE or VLAN configurations with active/bulk lease query leaks memory, eventually exhausting resources and triggering jdhcpd crash. …
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RemediationAI
Within 24 hours: Identify all MX Series routers in production running Junos OS versions before 22.4R3-S1, 23.2R2, or 23.4R2, and assess exposure in environments with active PPPoE or VLAN DHCPv6 configurations. Within 7 days: Apply vendor-released patches-upgrade to Junos OS 22.4R3-S1, 23.2R2, 23.4R2, or later. …
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