CVE-2021-21955Public exploitNetwork attack vector

Authentication bypass via timestamp-weakened AES key

Published Dec 9, 2021 · Updated Aug 3, 2024

Authentication bypass in Anker Innovations eufy HomeBase 2 2.1.6.9h allows remote attackers to recover an AES key by sniffing UDP traffic. The home_security binary's get_aes_key_info_by_packetid() function overwrites ten of 16 random key bytes with the packet timestamp, leaving only six unknown bytes. Remote attackers able to sniff the cleartext hub serial number and device time can brute-force the remaining key offline and authenticate privileged cloud-protocol commands.

CVSS severity7.7
High
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Anker Innovations eufy HomeBase 2 2.1.6.9h allows remote attackers to recover an AES key by sniffing UDP traffic. The home_security binary's get_aes_key_info_by_packetid() function overwrites ten of 16 random key bytes with the packet timestamp, leaving only six unknown bytes. Remote attackers able to sniff the cleartext hub serial number and device time can brute-force the remaining key offline and authenticate privileged cloud-protocol commands.

The record

CVE
CVE-2021-21955
Published
Dec 9, 2021
Updated
Aug 3, 2024
Vendor
Anker Innovations
Product
eufy HomeBase 2
Classifications
CWE-287, CWE-334, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 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

5.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:N/A:N
7.7Cisco TalosCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H
7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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-287Improper Authentication
CWE-334Small Space of Random Values
T1040Network Sniffing

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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