CVE-2021-40170Public exploit

Alarm disarming via replayed RF commands

Published Dec 15, 2021 · Updated Aug 4, 2024

RF replay in SecuritasHome home alarm system HPGW-G 0.0.2.23F BG_U-ITR-F1-BD_BL.A30.20181117 allows attackers to disarm alarms. The proprietary 868.638 MHz RF protocol accepts a previously captured disarm transmission again, causing the panel to repeat the recorded command. Attackers must first capture a legitimate transmission and later transmit it within radio range; replay can also trigger tamper signals and other recorded functions.

CVSS severity6.8
Medium
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

RF replay in SecuritasHome home alarm system HPGW-G 0.0.2.23F BG_U-ITR-F1-BD_BL.A30.20181117 allows attackers to disarm alarms. The proprietary 868.638 MHz RF protocol accepts a previously captured disarm transmission again, causing the panel to repeat the recorded command. Attackers must first capture a legitimate transmission and later transmit it within radio range; replay can also trigger tamper signals and other recorded functions.

The record

CVE
CVE-2021-40170
Published
Dec 15, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-294
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
5.8NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:P

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay

Public exploit references

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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