How severe is CVE-2021-43471?

CVE-2021-43471 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-43471 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43471?

CVE-2021-43471 affects Canon Lbp223dw Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43471?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-43471 published?

CVE-2021-43471 was published on 2021-12-06 and last updated on 2026-06-17.

CVE-2021-43471

CVE-2021-43471 is a high-severity vulnerability in Canon Lbp223dw Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-521.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-521
Affected product: Canon Lbp223dw Firmware
Published: 2021-12-06
Last modified: 2026-06-17

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.

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.
How severe is CVE-2021-43471?: CVE-2021-43471 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-43471 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43471?: CVE-2021-43471 affects Canon Lbp223dw Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43471?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-43471 published?: CVE-2021-43471 was published on 2021-12-06 and last updated on 2026-06-17.

References

https://github.com/cxaqhq/cve-1

Affected products (1)

cpe:2.3:o:canon:lbp223dw_firmware:-:*:*:*:*:*:*:*

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