CVE-2020-15343Network attack vector

Unauthenticated API access via missing authentication

Published Jun 26, 2020 · Updated Aug 4, 2024

Missing authentication in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows remote attackers to access the zy_install_user_key API. The HTTP endpoint accepts unauthenticated requests on ports 80 and 9673, but public sources do not disclose its request processing or key-installation semantics. The concrete consequence and any resulting access remain undisclosed, so data modification, code execution, and service interruption are not established.

CVSS severity5.3
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows remote attackers to access the zy_install_user_key API. The HTTP endpoint accepts unauthenticated requests on ports 80 and 9673, but public sources do not disclose its request processing or key-installation semantics. The concrete consequence and any resulting access remain undisclosed, so data modification, code execution, and service interruption are not established.

The record

CVE
CVE-2020-15343
Published
Jun 26, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-311, 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

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-311Missing Encryption of Sensitive Data
T1190Exploit Public-Facing Application

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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