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Public proof of concept

CVE-2021-43471

A public proof of concept exists; no exploitation attested.

  • Published2021-12-06
  • WeaknessCWE-521

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Canon LBP223 printers, the System Manager Mode login does not require an account password or PIN. An attacker can remotely shut down the device after entering the background, creating a denial of service vulnerability.

Timeline

dates in UTC
  1. 2021-12-0613:15CVE publishedNVD

Versions per branch

NVD
Canon lbp223dw firmwareversion to verify
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-12-06
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-w2mh-7rhp-pm58

Frequently asked questions

What is CVE-2021-43471?

In Canon LBP223 printers, the System Manager Mode login does not require an account password or PIN. An attacker can remotely shut down the device after entering the background, creating a denial of service vulnerability.

Is CVE-2021-43471 actively exploited?

Active exploitation of CVE-2021-43471 has not been confirmed. Its EPSS score was 1.5% on 2026-11-13, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-43471?

CVE-2021-43471 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record