CVE-2021-21951Public exploitNetwork attack vector

Remote code execution via unchecked domain count

Published Dec 8, 2021 · Updated Aug 3, 2024

An out-of-bounds write in Anker Innovations eufy HomeBase 2 2.1.6.9h allows remote attackers to execute code via a crafted UDP packet. The read_udp_push_config_file function trusts the persisted domain_total value and uses its loop index to clear and copy 128-byte domain entries beyond a fixed global array. Unauthenticated server-list messages can plant the value remotely, and the resulting write-what-where condition is reached when the configuration is read after reboot.

CVSS severity10.0
Critical
EPSS probability2.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in Anker Innovations eufy HomeBase 2 2.1.6.9h allows remote attackers to execute code via a crafted UDP packet. The read_udp_push_config_file function trusts the persisted domain_total value and uses its loop index to clear and copy 128-byte domain entries beyond a fixed global array. Unauthenticated server-list messages can plant the value remotely, and the resulting write-what-where condition is reached when the configuration is read after reboot.

The record

CVE
CVE-2021-21951
Published
Dec 8, 2021
Updated
Aug 3, 2024
Vendor
Anker Innovations
Product
eufy HomeBase 2
Classifications
CWE-119, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Anker Eufy Homebase 2 2.1.6.9h

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Anker Innovations · eufy HomeBase 2version=Anker Eufy Homebase 2 2.1.6.9h

Published CVSS scores

10.0Cisco TalosCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

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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