EUVD-2026-21086
GHSA-9p4v-567m-9ggg
Severity by source
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
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
7DescriptionCVE.org
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.
AnalysisAI
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. Authentication packet-type configuration must be active for exploitation. No public exploit identified at time of analysis.
Technical ContextAI
CWE-401 memory leak occurs in bbe-smgd when authentication packet-type filtering is enabled and incoming packets fail type validation. Each rejected packet allocates memory that is never released, progressively exhausting daemon heap until resource limit triggers SMD_DPROF_RSMON_ERROR. Adjacent network access (AV:A) required; exploit does not require authentication credentials (PR:N).
RemediationAI
Vendor-released patches: upgrade Junos OS to 22.4R3-S8, 23.2R2-S5, 23.4R2-S6, 24.2R2-S2, 24.4R2, or 25.2R2 depending on installed branch. Workaround: remove authentication packet-type configuration from bbe-smgd if operationally feasible to eliminate leak trigger condition. Monitor daemon memory consumption using 'show system processes extensive | match bbe-smgd' to detect exploitation attempts. Review adjacent network access controls to limit attacker proximity to vulnerable interfaces. Full vendor advisory with affected version matrix: https://kb.juniper.net/JSA107821
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Same weakness CWE-401 – Memory Leak
View allSame technique Denial Of Service
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External POC / Exploit Code
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