EUVD-2026-21086
GHSA-9p4v-567m-9ggg
CVSS Vector
CVSS:4.0/AV:A/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
3Description
A Missing Release of Memory after Effective Lifetime vulnerability in the BroadBand Edge subscriber management daemon (bbe-smgd) of Juniper Networks Junos OS on MX Series allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS). If the authentication packet-type option is configured and a received packet does not match that packet type, the memory leak occurs. When all memory available to bbe-smgd has been consumed, no new subscribers will be able to login. The memory utilization of bbe-smgd can be monitored with the following show command: user@host> show system processes extensive | match bbe-smgd The below log message can be observed when this limit has been reached: bbesmgd[<PID>]: %DAEMON-3-SMD_DPROF_RSMON_ERROR: Resource unavailability, Reason: Daemon Heap Memory exhaustion This issue affects Junos OS on MX Series: * all versions before 22.4R3-S8, * 23.2 versions before 23.2R2-S5, * 23.4 versions before 23.4R2-S6, * 24.2 versions before 24.2R2-S2, * 24.4 versions before 24.4R2, * 25.2 versions before 25.2R2.
Analysis
Memory exhaustion in Juniper Networks Junos OS BroadBand Edge subscriber management daemon (bbe-smgd) on MX Series allows adjacent unauthenticated attackers to trigger persistent denial of service by sending authentication packets that do not match configured packet-type options. Each mismatched packet leaks memory, eventually consuming all available daemon heap memory and preventing new subscriber logins. …
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Remediation
Within 24 hours: Inventory all MX Series routers running Junos OS and document current software versions; contact Juniper Networks support to confirm affected versions and obtain timeline for patch availability. Within 7 days: Implement network segmentation to restrict authentication packet sources to trusted management networks only; enable detailed daemon logging to detect exploitation attempts. …
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External POC / Exploit Code
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