CVE-2022-40111Public exploitNetwork attack vector

Root shell access via hard-coded Telnet credentials

Published Sep 6, 2022 · Updated Aug 3, 2024

Hard-coded credentials in TOTOLINK A3002R firmware 1.1.1-B20200824.0128 allow remote attackers to obtain a root shell over Telnet. The firmware embeds a fixed root credential in shadow.sample and enables its Telnet service on TCP port 23 by default. Any network-reachable attacker can authenticate as root with the decoded password and obtain full command execution on the router.

CVSS severity9.8
Critical
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in TOTOLINK A3002R firmware 1.1.1-B20200824.0128 allow remote attackers to obtain a root shell over Telnet. The firmware embeds a fixed root credential in shadow.sample and enables its Telnet service on TCP port 23 by default. Any network-reachable attacker can authenticate as root with the decoded password and obtain full command execution on the router.

The record

CVE
CVE-2022-40111
Published
Sep 6, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 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 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
T1078.001Default 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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