CVE-2026-33775 Junos OS: MX Series: Mismatch between configured and received packet types causes memory leak in bbe-smgd
An adjacent attacker can cause a memory leak in the subscriber management daemon, leading to denial of service for new logins.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-33775?
CVE-2026-33775 is a high-severity denial of service vulnerability in Juniper Junos, published on 9 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-401
Which versions are affected by CVE-2026-33775?
It affects 1 product.
Products include Juniper Junos.
How do I fix CVE-2026-33775?
No fix has been published for CVE-2026-33775 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-33775 being exploited?
There is no known exploitation of CVE-2026-33775 in the wild and no public exploit code.
Other vulnerabilities in Juniper Junos
- CVE-2023-36845 Juniper Junos OS EX Series and SRX Series PHP External Variable Modification
- CVE-2020-1631 Juniper Junos OS Path Traversal
- CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization
- CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function
- CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification
Sources
Also known as GHSA-9p4v-567m-9ggg.