CVE-2020-15341Public exploitNetwork attack vector

Unauthenticated access via backdoor license API

Published Jun 26, 2020 · Updated Aug 4, 2024

Authentication bypass in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows remote attackers to access license-management data via an unauthenticated API. The update_all_realm_license endpoint is exposed without authentication and invokes license-management functionality for a caller-supplied cnmid value. No login or user interaction is required, so exposure depends on network reachability of the management interface.

CVSS severity7.5
High
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows remote attackers to access license-management data via an unauthenticated API. The update_all_realm_license endpoint is exposed without authentication and invokes license-management functionality for a caller-supplied cnmid value. No login or user interaction is required, so exposure depends on network reachability of the management interface.

The record

CVE
CVE-2020-15341
Published
Jun 26, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-522, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2020CVE 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1190Exploit Public-Facing Application

Public exploit references

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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