CVE-2021-21953: An authentication bypass vulnerability exists in the process_msg() function of the home_security binary of Ank

This week

HIGH 8.1REMOTEMITIGATE

CVE-2021-21953 is a high-severity flaw (CVSS 8.1) affecting eufy homebase 2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An authentication bypass vulnerability exists in the process_msg() function of the home_security binary of Anker Eufy Homebase 2 2.1.6.9h. A specially-crafted man-in-the-middle attack can lead to increased privileges.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-300
Published	2021-12-22
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: anker

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

Am I affected?

Timeline

2021-12-22 19:15 UTCPublished CVE record published
2026-06-17 03:36 UTCUpdated Record last modified

anker eufy homebase 2 firmware MITIGATE

Affected: 2.1.6.9h

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.6.9h

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-2021-21953?

eufy homebase 2 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-21953 being exploited?

CVE-2021-21953 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-2021-21953 affect?

CVE-2021-21953 affects eufy homebase 2 firmware. Severity is high (CVSS 8.1). An authentication bypass vulnerability exists in the process_msg() function of the home_security binary of Anker Eufy Homebase 2 2.1.6.9h. A specially-crafted man-in-the-middle attack can lead to increased privileges.

How urgent is CVE-2021-21953?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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