How severe is CVE-2021-39363?

CVE-2021-39363 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39363 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39363?

CVE-2021-39363 primarily affects Honeywell Hdzp252di Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-39363?

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

When was CVE-2021-39363 published?

CVE-2021-39363 was published on 2022-02-24 and last updated on 2026-06-17.

CVE-2021-39363

CVE-2021-39363 is a critical-severity vulnerability in Honeywell Hdzp252di Firmware with a CVSS 3.x base score of 9.8. 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-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Honeywell Hdzp252di Firmware
Published: 2022-02-24
Last modified: 2026-06-17

Description

Honeywell HDZP252DI 1.00.HW02.4 and HBW2PER1 1.000.HW01.3 devices allow a video replay attack after ARP cache poisoning has been achieved.

Frequently asked questions

What is CVE-2021-39363?: Honeywell HDZP252DI 1.00.HW02.4 and HBW2PER1 1.000.HW01.3 devices allow a video replay attack after ARP cache poisoning has been achieved.
How severe is CVE-2021-39363?: CVE-2021-39363 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39363 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39363?: CVE-2021-39363 primarily affects Honeywell Hdzp252di Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-39363?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-39363 published?: CVE-2021-39363 was published on 2022-02-24 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:honeywell:hdzp252di_firmware:1.00.hw02.4:*:*:*:*:*:*:*
cpe:2.3:o:honeywell:hbw2per1_firmware:1.000.hw01.3:*:*:*:*:*:*:*

More vulnerabilities in Honeywell Hdzp252di Firmware

CVE-2019-18226 — Critical (CVSS 9.8): Honeywell equIP series and Performance series IP cameras and recorders, A vulnerability exists in the affected products…
CVE-2021-39364 — High (CVSS 7.5): Honeywell HDZP252DI 1.00.HW02.4 and HBW2PER1 1.000.HW01.3 devices allow command spoofing (for camera control) after ARP…
CVE-2019-18230 — High (CVSS 7.5): Honeywell equIP and Performance series IP cameras, multiple versions, A vulnerability exists where the affected product…
CVE-2019-18228 — High (CVSS 7.5): Honeywell equIP series IP cameras Multiple equIP Series Cameras, A vulnerability exists in the affected products where…

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