CVE-2021-47796Public exploitNetwork attack vector

Unauthenticated shell access via hardcoded Telnet credential

Published Jan 15, 2026 · Updated Jan 15, 2026

Hardcoded credentials in Denver SHC-150 Smart Wifi Camera allow remote attackers to gain unauthenticated Linux shell access over Telnet. The Telnet service on TCP port 23 accepts the factory credential "default" and starts a shell instead of requiring a device-unique credential. Network reachability to port 23 is sufficient, and the resulting shell permits arbitrary operating-system commands.

CVSS severity9.3
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hardcoded credentials in Denver SHC-150 Smart Wifi Camera allow remote attackers to gain unauthenticated Linux shell access over Telnet. The Telnet service on TCP port 23 accepts the factory credential "default" and starts a shell instead of requiring a device-unique credential. Network reachability to port 23 is sufficient, and the resulting shell permits arbitrary operating-system commands.

The record

CVE
CVE-2021-47796
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Denver A/S
Product
DENVER SHC-150
Classifications
CWE-798, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=SHC-150

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Denver A/S · DENVER SHC-150version=SHC-150

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
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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