CVE-2021-21940: A heap-based buffer overflow vulnerability exists in the pushMuxer processRtspInfo functionality of Anker Eufy

This week

CRITICAL 10.0REMOTEMITIGATE

CVE-2021-21940 is a critical-severity flaw (CVSS 10.0) affecting eufy homebase 2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A heap-based buffer overflow vulnerability exists in the pushMuxer processRtspInfo functionality of Anker Eufy Homebase 2 2.1.6.9h. A specially-crafted network packet can lead to a heap buffer overflow. An attacker can send a malicious packet to trigger this vulnerability.

Why this priority

Critical 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	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-122, CWE-787
Published	2021-10-12
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

2021-10-12 14:15 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-2021-21940?

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

Is CVE-2021-21940 being exploited?

CVE-2021-21940 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-2021-21940 affect?

CVE-2021-21940 affects eufy homebase 2 firmware. Severity is critical (CVSS 10.0). A heap-based buffer overflow vulnerability exists in the pushMuxer processRtspInfo functionality of Anker Eufy Homebase 2 2.1.6.9h. A specially-crafted network packet can lead to a heap buffer overflow. An attacker can send a malicious pack

How urgent is CVE-2021-21940?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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