CVE-2020-15335Public exploitNetwork attack vector

Unauthenticated account creation via open CPE registration

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 create CPE accounts via /registerCpe. The root-running xmppCnrSender.py gateway exposes /registerCpe on WAN TCP port 8083 and accepts JID and password values without an authentication check. Because registration is open by default, any network-reachable attacker can create accounts and alter the appliance's CPE-management state without prior access.

CVSS severity7.5
High
EPSS probability0.93%
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 create CPE accounts via /registerCpe. The root-running xmppCnrSender.py gateway exposes /registerCpe on WAN TCP port 8083 and accepts JID and password values without an authentication check. Because registration is open by default, any network-reachable attacker can create accounts and alter the appliance's CPE-management state without prior access.

The record

CVE
CVE-2020-15335
Published
Jun 26, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-306, T1136
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

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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.

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

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-306Missing Authentication for Critical Function
T1136Create Account

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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