Is CVE-2021-45740 actively exploited?

No active exploitation of CVE-2021-45740 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-45740 be exploited remotely?

Yes. CVE-2021-45740 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-45740?

CVE-2021-45740 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-45740

NVD-CWE-noinfoPublished: February 4, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

TOTOLINK A720R v4.1.5cu.470_B20200911 was discovered to contain a stack overflow in the setWiFiWpsStart function. This vulnerability allows attackers to cause a Denial of Service (DoS) via the pin parameter.

NVD Source

Technical Analysis

CVE-2021-45740 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.