CVE-2021-38154Known exploitationPublic exploitNetwork attack vector

Sensitive-data exfiltration via zero-PIN bypass

Published Aug 29, 2021 · Updated Aug 4, 2024

Authentication bypass in Canon Catwalk Server devices made from 2012 through 2020 allows remote attackers to redirect sensitive data by e-mail. The Catwalk Server HTTP portal accepts 0000 as the General User Mode PIN on affected configurations, granting access to the e-mail address setting. Exposure requires HTTP access to Catwalk Server on an affected device; redirected messages can include incoming faxes.

CVSS severity7.5
High
EPSS probability4.00%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Canon Catwalk Server devices made from 2012 through 2020 allows remote attackers to redirect sensitive data by e-mail. The Catwalk Server HTTP portal accepts 0000 as the General User Mode PIN on affected configurations, granting access to the e-mail address setting. Exposure requires HTTP access to Catwalk Server on an affected device; redirected messages can include incoming faxes.

The record

CVE
CVE-2021-38154
Published
Aug 29, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-732, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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