How severe is CVE-2021-21940?

CVE-2021-21940 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21940 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21940?

CVE-2021-21940 affects Anker Eufy Homebase 2 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21940?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-21940 published?

CVE-2021-21940 was published on 2021-10-12 and last updated on 2026-06-17.

CVE-2021-21940

CVE-2021-21940 is a critical-severity vulnerability in Anker Eufy Homebase 2 Firmware with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v2: 7.5
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Anker Eufy Homebase 2 Firmware
Published: 2021-10-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-21940?: 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.
How severe is CVE-2021-21940?: CVE-2021-21940 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21940 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21940?: CVE-2021-21940 affects Anker Eufy Homebase 2 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21940?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-21940 published?: CVE-2021-21940 was published on 2021-10-12 and last updated on 2026-06-17.

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1369

Affected products (1)

cpe:2.3:o:anker:eufy_homebase_2_firmware:2.1.6.9h:*:*:*:*:*:*:*

More vulnerabilities in Anker Eufy Homebase 2 Firmware

CVE-2021-21951 — Critical (CVSS 10.0): An out-of-bounds write vulnerability exists in the CMD_DEVICE_GET_SERVER_LIST_REQUEST functionality of the…
CVE-2021-21950 — Critical (CVSS 10.0): An out-of-bounds write vulnerability exists in the CMD_DEVICE_GET_SERVER_LIST_REQUEST functionality of the…
CVE-2021-21954 — Critical (CVSS 9.9): A command execution vulnerability exists in the wifi_country_code_update functionality of the home_security binary of…
CVE-2022-29503 — Critical (CVSS 9.8): A memory corruption vulnerability exists in the libpthread linuxthreads functionality of uClibC 0.9.33.2 and uClibC-ng…
CVE-2022-21806 — Critical (CVSS 9.8): A use-after-free vulnerability exists in the mips_collector appsrv_server functionality of Anker Eufy Homebase 2…
CVE-2021-21952 — Critical (CVSS 9.8): An authentication bypass vulnerability exists in the CMD_DEVICE_GET_RSA_KEY_REQUEST functionality of the home_security…

All CVEs affecting Anker Eufy Homebase 2 Firmware →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →