How severe is CVE-2021-39364?

CVE-2021-39364 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 high, and availability none.

Is CVE-2021-39364 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39364?

CVE-2021-39364 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-2021-39364?

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-2021-39364 published?

CVE-2021-39364 was published on 2022-02-24 and last updated on 2026-06-17.

CVE-2021-39364

CVE-2021-39364 is a high-severity vulnerability in Honeywell Hdzp252di 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-294.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-294
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 command spoofing (for camera control) after ARP cache poisoning has been achieved.

Frequently asked questions

What is CVE-2021-39364?: Honeywell HDZP252DI 1.00.HW02.4 and HBW2PER1 1.000.HW01.3 devices allow command spoofing (for camera control) after ARP cache poisoning has been achieved.
How severe is CVE-2021-39364?: CVE-2021-39364 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 high, and availability none.
Is CVE-2021-39364 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39364?: CVE-2021-39364 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-2021-39364?: 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-2021-39364 published?: CVE-2021-39364 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-2021-39363 — Critical (CVSS 9.8): Honeywell HDZP252DI 1.00.HW02.4 and HBW2PER1 1.000.HW01.3 devices allow a video replay attack after ARP cache poisoning…
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-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…

All CVEs affecting Honeywell Hdzp252di Firmware →

Other CWE-294 (Authentication Bypass by Capture-replay) vulnerabilities

CVE-2025-49752 — Critical (CVSS 10.0): Azure Bastion Elevation of Privilege Vulnerability
CVE-2026-11856 — Critical (CVSS 9.8): Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then…
CVE-2026-32987 — Critical (CVSS 9.8): OpenClaw before 2026.3.13 allows bootstrap setup codes to be replayed during device pairing verification in…
CVE-2025-67135 — Critical (CVSS 9.8): Weak Security in the PF-50 1.2 keyfob of PGST PG107 Alarm System 1.25.05.hf allows attackers to compromise access…
CVE-2025-65552 — Critical (CVSS 9.8): D3D Wi-Fi Home Security System ZX-G12 v2.1.1 is vulnerable to RF replay attacks on the 433 MHz sensor communication…
CVE-2024-38438 — Critical (CVSS 9.8): D-Link - CWE-294: Authentication Bypass by Capture-replay

Browse all CWE-294 (Authentication Bypass by Capture-replay) vulnerabilities →