CVE-2020-35559Network attack vector

Authenticated provisioning denial via IP exhaustion

Published Feb 16, 2021 · Updated Aug 4, 2024

Resource exhaustion in MB CONNECT LINE mbCONNECT24 and mymbCONNECT24 2.6.2 and earlier allows remote authenticated users to block provisioning. The unused account function consumes every available IP address without preserving capacity for later provisioning. Any authenticated account user can exhaust the address pool, preventing creation of additional devices and users without affecting confidentiality or integrity.

CVSS severity4.3
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in MB CONNECT LINE mbCONNECT24 and mymbCONNECT24 2.6.2 and earlier allows remote authenticated users to block provisioning. The unused account function consumes every available IP address without preserving capacity for later provisioning. Any authenticated account user can exhaust the address pool, preventing creation of additional devices and users without affecting confidentiality or integrity.

The record

CVE
CVE-2020-35559
Published
Feb 16, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.3MB connect lineCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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