CVE-2022-38556Network attack vector

Unauthenticated device access via static telnet credentials

Published Aug 28, 2022 · Updated Aug 3, 2024

Static default credentials in TRENDnet TEW733GR 1.03B01 allow remote attackers to obtain unauthorized telnet access over the network. The /etc/init0.d/S80telnetd.sh startup script embeds a static default credential for the telnet service, making the same login secret available from the firmware image. Exploitation requires network access to the telnet service but no prior account or user interaction; the resulting session has the embedded account's privileges.

CVSS severity9.8
Critical
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Static default credentials in TRENDnet TEW733GR 1.03B01 allow remote attackers to obtain unauthorized telnet access over the network. The /etc/init0.d/S80telnetd.sh startup script embeds a static default credential for the telnet service, making the same login secret available from the firmware image. Exploitation requires network access to the telnet service but no prior account or user interaction; the resulting session has the embedded account's privileges.

The record

CVE
CVE-2022-38556
Published
Aug 28, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 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-287Improper Authentication
T1078.001Valid Accounts: Default Accounts

Public exploit references

No public exploit references are available in this record.

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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