CVE-2020-15331Public exploitNetwork attack vector

Cloud OAuth secret exposure via hardcoded configuration

Published Jun 26, 2020 · Updated Aug 4, 2024

Hardcoded credentials in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allow attackers to obtain the OAuth secret used for cloud communications. The CloudCNM web configuration reads OAUTH_SECRET_KEY from /opt/axess/etc/default/axess, where every affected installation contains the same embedded value. The fixed secret is disclosed in public research, but available sources do not document which cloud operations it authorizes or demonstrate resulting data access or service control.

CVSS severity9.8
Critical
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hardcoded credentials in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allow attackers to obtain the OAuth secret used for cloud communications. The CloudCNM web configuration reads OAUTH_SECRET_KEY from /opt/axess/etc/default/axess, where every affected installation contains the same embedded value. The fixed secret is disclosed in public research, but available sources do not document which cloud operations it authorizes or demonstrate resulting data access or service control.

The record

CVE
CVE-2020-15331
Published
Jun 26, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-311, T1552.001
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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-311Missing Encryption of Sensitive Data
T1552.001Unsecured Credentials: Credentials In Files

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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