CVE-2021-45740

Name: CVE-2021-45740
Creator: NVD / NIST
Published: 2022-02-04T02:15:08.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2021-45740 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.34%

67.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Totolink	A720r Firmware	4.1.5cu.470_b20200911

References

https://github.com/pjqwudi/my_vuln/blob/main/totolink/vuln_4/4.mdExploit, Third Party Advisory
https://github.com/pjqwudi/my_vuln/blob/main/totolink/vuln_4/4.mdExploit, Third Party Advisory

Timeline

Published: Feb 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-45740?

How severe is CVE-2021-45740?

CVE-2021-45740 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-45740?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-45740?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST