CVE-2021-39363Network attack vector

Video replay via ARP cache poisoning

Published Feb 24, 2022 · Updated Aug 4, 2024

Video replay in Honeywell HDZP252DI 1.00.HW02.4 and HBW2PER1 1.000.HW01.3 allows remote attackers to substitute prerecorded video. The published record identifies ARP cache poisoning as the prerequisite but does not disclose which protocol data lacks freshness or integrity validation. Honeywell maps this identifier to a different insecure-ONVIF PTZ command-injection flaw, leaving the record's replay mechanism unresolved.

CVSS severity6.5
Medium
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Video replay in Honeywell HDZP252DI 1.00.HW02.4 and HBW2PER1 1.000.HW01.3 allows remote attackers to substitute prerecorded video. The published record identifies ARP cache poisoning as the prerequisite but does not disclose which protocol data lacks freshness or integrity validation. Honeywell maps this identifier to a different insecure-ONVIF PTZ command-injection flaw, leaving the record's replay mechanism unresolved.

The record

CVE
CVE-2021-39363
Published
Feb 24, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1557.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2022CVE 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

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:P
5.9HoneywellCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L/E:P/RL:O/RC:C
6.5HoneywellCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L

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-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1557.002Adversary-in-the-Middle: ARP Cache Poisoning

Public exploit references

No public exploit references are available in this record.

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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