CVE-2021-45742

Name: CVE-2021-45742
Creator: NVD / NIST
Published: 2022-02-04T02:15:08.487+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.10%

Last modified Jun 17, 2026

CVE-2021-45742 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 command injection vulnerability in the "Main" function. This vulnerability allows attackers to execute arbitrary commands via the QUERY_STRING parameter.. EPSS estimates a 3.10% chance of exploitation in the next 30 days.

Description

TOTOLINK A720R v4.1.5cu.470_B20200911 was discovered to contain a command injection vulnerability in the "Main" function. This vulnerability allows attackers to execute arbitrary commands via the QUERY_STRING 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

3.10%

86.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-77

Affected Software

Vendor	Product	Versions
Totolink	A720r Firmware	4.1.5cu.470_b20200911

References

https://github.com/pjqwudi/my_vuln/blob/main/totolink/vuln_3/3.mdExploit, Third Party Advisory
https://github.com/pjqwudi/my_vuln/blob/main/totolink/vuln_3/3.mdExploit, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-45742?

How severe is CVE-2021-45742?

CVE-2021-45742 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.10% probability of exploitation in the next 30 days.

How do I fix CVE-2021-45742?

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-2021-45742?

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

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Source: NVD / NIST