CVE-2020-15318Public exploitNetwork attack vector

Traffic decryption via hardcoded DSA host key

Published Jun 29, 2020 · Updated Aug 4, 2024

Hardcoded SSH host keys in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allow man-in-the-middle attackers to decrypt management traffic. The mysql chroot uses a shipped DSA host private key instead of generating a unique key, enabling an interceptor to impersonate its SSH endpoint. Exploitation requires a man-in-the-middle position on a management connection; the reported consequence is traffic decryption, not root login.

CVSS severity5.9
Medium
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hardcoded SSH host keys in Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allow man-in-the-middle attackers to decrypt management traffic. The mysql chroot uses a shipped DSA host private key instead of generating a unique key, enabling an interceptor to impersonate its SSH endpoint. Exploitation requires a man-in-the-middle position on a management connection; the reported consequence is traffic decryption, not root login.

The record

CVE
CVE-2020-15318
Published
Jun 29, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1557
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

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
5.9NIST NVDCVSS: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.

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-798Use of Hard-coded Credentials
T1557Adversary-in-the-Middle

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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