Memory Leak Vulnerability in Junos OS Affects MX Series Devices
CVE-2026-33775

7.1HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Vendor
CVE Published:
9 April 2026

Badges

👾 Exploit Exists

What is CVE-2026-33775?

A memory leak issue exists in the BroadBand Edge subscriber management daemon (bbe-smgd) of Juniper Networks' Junos OS, specifically affecting MX Series devices. This vulnerability enables an unauthenticated adjacent attacker to cause a Denial of Service (DoS) by exhausting the memory related to bbe-smgd when an incorrectly configured authentication packet-type option does not align with the received packet type. As memory depletes, the daemon may reach a state where new subscribers are unable to log in, leading to operational instability. Monitoring tools such as 'show system processes extensive | match bbe-smgd' can be used to check memory utilization and identify potential exhaustion scenarios.

Affected Version(s)

Junos OS MX Series 0 < 22.4R3-S8

Junos OS MX Series 23.2 < 23.2R2-S5

Junos OS MX Series 23.4 < 23.4R2-S6

References

https://kb.juniper.net/JSA107821
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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