CVE-2021-40170: An RF replay attack vulnerability in the SecuritasHome home alarm system, version HPGW-G 0.0.2.23F BG_U-ITR-F1

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MEDIUM 6.8MITIGATE

CVE-2021-40170 is a medium-severity flaw (CVSS 6.8) affecting securitashome alarm system firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An RF replay attack vulnerability in the SecuritasHome home alarm system, version HPGW-G 0.0.2.23F BG_U-ITR-F1-BD_BL.A30.20181117, allows an attacker to trigger arbitrary system functionality by replaying previously recorded signals. This lets an adversary, among other things, disarm an armed system.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-294
Published	2021-12-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: securitashome

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-12-15 07:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

securitashome securitashome alarm system firmware MITIGATE

Affected: hpgw-g_0.0.2.23f_bg_u-itr-f1-bd_bl.a30.20181117

Fixed in: no fixed release known

Safe to downgrade to: a release before hpgw-g_0.0.2.23f_bg_u-itr-f1-bd_bl.a30.20181117

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-40170?

securitashome alarm system firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-40170 being exploited?

CVE-2021-40170 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-40170 affect?

CVE-2021-40170 affects securitashome alarm system firmware. Severity is medium (CVSS 6.8). An RF replay attack vulnerability in the SecuritasHome home alarm system, version HPGW-G 0.0.2.23F BG_U-ITR-F1-BD_BL.A30.20181117, allows an attacker to trigger arbitrary system functionality by replaying previously recorded signals. This l

How urgent is CVE-2021-40170?

Priority 44/100. Public exploit reference

Related CVEs

CVE-2021-40171 MEDIUM 5.3 MITIGATE The absence of notifications regarding an ongoing RF jamming attack in the SecuritasHome home alarm system, ve

References

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