CVE-2026-33775

Subscriber login denial via packet-type memory leak

Published Apr 9, 2026 · Updated Apr 9, 2026

Memory leak in bbe-smgd in Juniper Networks Junos OS on MX Series allows attackers to block new subscriber logins from adjacent networks. When authentication packet-type is configured, bbe-smgd fails to release memory for received packets whose type does not match the configured type. The non-default packet-type configuration and adjacent network access are required; exhaustion prevents new subscriber logins.

CVSS severity7.1
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in bbe-smgd in Juniper Networks Junos OS on MX Series allows attackers to block new subscriber logins from adjacent networks. When authentication packet-type is configured, bbe-smgd fails to release memory for received packets whose type does not match the configured type. The non-default packet-type configuration and adjacent network access are required; exhaustion prevents new subscriber logins.

The record

CVE
CVE-2026-33775
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-401, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <22.4R3-S8
  2. Affected versionversion=23.2 <23.2R2-S5
  3. Affected versionversion=23.4 <23.4R2-S6
  4. Affected versionversion=24.2 <24.2R2-S2
  5. Affected versionversion=24.4 <24.4R2
  6. Affected versionversion=25.2 <25.2R2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <22.4R3-S8; version=23.2 <23.2R2-S5; version=23.4 <23.4R2-S6; version=24.2 <24.2R2-S2; version=24.4 <24.4R2; version=25.2 <25.2R2

Published CVSS scores

7.1Juniper Networks, Inc.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
6.5Juniper Networks, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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