CVE-2021-30028Public exploitNetwork attack vector

Firmware compromise via default Telnet credentials

Published May 20, 2022 · Updated Aug 3, 2024

Default credentials in the Telnet service of SOOTEWAY Wi-Fi Range Extender 1.5 allow remote attackers to gain administrative access. The device exposes Telnet on TCP port 23 and accepts the factory-set admin:admin credentials rather than a device-specific secret. Reachability to port 23 is sufficient while the default credentials remain active; firmware erasure renders the device unusable, while read or write access compromises its contents.

CVSS severity7.2
High
EPSS probability1.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Default credentials in the Telnet service of SOOTEWAY Wi-Fi Range Extender 1.5 allow remote attackers to gain administrative access. The device exposes Telnet on TCP port 23 and accepts the factory-set admin:admin credentials rather than a device-specific secret. Reachability to port 23 is sufficient while the default credentials remain active; firmware erasure renders the device unusable, while read or write access compromises its contents.

The record

CVE
CVE-2021-30028
Published
May 20, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1078.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
9.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:S/C:C/I:C/A:C

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1078.001Valid Accounts: Default 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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