CVE-2021-3821Network attack vector

Remote service interruption through undisclosed Workpath flaw

Published Nov 21, 2022 · Updated Apr 29, 2025

Denial of service in HP FutureSmart before 5.3 allows remote attackers to interrupt MFP operation through a Workpath solution. HP has not published the underlying flaw or the operation performed incorrectly on attacker-controlled input. Exploitation requires an affected multifunction printer to run HP Workpath; the record does not specify whether interruption takes the form of a hang, crash, or reboot.

CVSS severity8.1
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in HP FutureSmart before 5.3 allows remote attackers to interrupt MFP operation through a Workpath solution. HP has not published the underlying flaw or the operation performed incorrectly on attacker-controlled input. Exploitation requires an affected multifunction printer to run HP Workpath; the record does not specify whether interruption takes the form of a hang, crash, or reboot.

The record

CVE
CVE-2021-3821
Published
Nov 21, 2022
Updated
Apr 29, 2025
Vendor
HP Inc.
Product
HP FutureSmart
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2025Record 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=See HP Security Bulletin reference for affected versions.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HP Inc. · HP FutureSmartversion=See HP Security Bulletin reference for affected versions.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1HP Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS: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.

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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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