CVE-2020-15316Public exploitNetwork attack vector

Root SSH access via hardcoded ECDSA key

Published Jun 29, 2020 · Updated Aug 4, 2024

Use of hard-coded credentials in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows remote attackers to access the root account via SSH. The /opt/axess chroot directory contains a reusable ECDSA private key associated with root, so possession of the key supplies authentication material rather than exploiting a memory-safety flaw. Exposure requires network reachability to the SSH service and permits root-level confidentiality and integrity impact on the SecuManager host.

CVSS severity4.3
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of hard-coded credentials in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows remote attackers to access the root account via SSH. The /opt/axess chroot directory contains a reusable ECDSA private key associated with root, so possession of the key supplies authentication material rather than exploiting a memory-safety flaw. Exposure requires network reachability to the SSH service and permits root-level confidentiality and integrity impact on the SecuManager host.

The record

CVE
CVE-2020-15316
Published
Jun 29, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1078.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 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

4.3NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
5.9NVDCVSS:3.1/AV:N/AC:H/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-798Use of Hard-coded Credentials
T1078.003Valid Accounts: Local Accounts

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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