CVE-2020-9435Network attack vector

Sensitive data exposure via hardcoded web certificate

Published Mar 12, 2020 · Updated Aug 4, 2024

Use of hardcoded credentials in PHOENIX CONTACT TC ROUTER and TC CLOUD CLIENT firmware through affected versions allows remote attackers to read data via web services. Each device ships with a generic X.509 certificate and private key used by default for its web service, enabling impersonation, man-in-the-middle interception, or passive decryption. The exposure requires network access to the web service while the generic certificate remains installed; the vendor reports access to credentials, configuration parameters, and status information.

CVSS severity9.1
Critical
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of hardcoded credentials in PHOENIX CONTACT TC ROUTER and TC CLOUD CLIENT firmware through affected versions allows remote attackers to read data via web services. Each device ships with a generic X.509 certificate and private key used by default for its web service, enabling impersonation, man-in-the-middle interception, or passive decryption. The exposure requires network access to the web service while the generic certificate remains installed; the vendor reports access to credentials, configuration parameters, and status information.

The record

CVE
CVE-2020-9435
Published
Mar 12, 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. Mar 12, 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

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.1CERT VDECVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 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-798Use of Hard-coded Credentials
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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