CVE-2021-46008Public exploit

Root shell via hard-coded Telnet password

Published Mar 30, 2022 · Updated Jul 9, 2026

Use of hard-coded credentials in TOTOLINK A3100R V5.9c.4577 allows remote attackers to obtain a root shell via Telnet after Wi-Fi access. The firmware exposes the Telnet password in product.ini or a crackable root hash in shadow.sample. The attack requires Wi-Fi adjacency and Telnet enabled, then grants full device control through the root shell.

CVSS severity8.8
High
EPSS probability0.92%
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 TOTOLINK A3100R V5.9c.4577 allows remote attackers to obtain a root shell via Telnet after Wi-Fi access. The firmware exposes the Telnet password in product.ini or a crackable root hash in shadow.sample. The attack requires Wi-Fi adjacency and Telnet enabled, then grants full device control through the root shell.

The record

CVE
CVE-2021-46008
Published
Mar 30, 2022
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1021.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.9NIST NVDAV:A/AC:M/Au:N/C:C/I:C/A:C
8.8NIST NVDCVSS:3.1/AV:A/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1021.001Remote Services: Telnet

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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