CVE-2021-4242

Name: CVE-2021-4242
Creator: NVD / NIST
Published: 2022-11-30T14:15:10.67+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 3.02%

Last modified Jun 17, 2026

CVE-2021-4242 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A vulnerability was found in Sapido BR270n, BRC76n, GR297 and RB1732 and classified as critical. Affected by this issue is some unknown functionality of the file ip/syscmd.htm. EPSS estimates a 3.02% chance of exploitation in the next 30 days.

Description

A vulnerability was found in Sapido BR270n, BRC76n, GR297 and RB1732 and classified as critical. Affected by this issue is some unknown functionality of the file ip/syscmd.htm. The manipulation leads to os command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-214592.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

3.02%

85.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sapido	Br270n Firmware	2.1.03
Sapido	Brc76n Firmware	2.1.03
Sapido	Gr297n Firmware	2.1.3
Sapido	Rb-1732 Firmware	2.0.43

References

https://blog.csdn.net/qq_44159028/article/details/114590267Exploit, Third Party Advisory
https://github.com/smallpiggy/Sapido--rce/blob/main/Sapido%E8%B7%AF%E7%94%B1%E5%99%A8-rce.pyExploit, Third Party Advisory
https://vuldb.com/?id.214592Third Party Advisory
https://blog.csdn.net/qq_44159028/article/details/114590267Exploit, Third Party Advisory
https://github.com/smallpiggy/Sapido--rce/blob/main/Sapido%E8%B7%AF%E7%94%B1%E5%99%A8-rce.pyExploit, Third Party Advisory
https://vuldb.com/?id.214592Third Party Advisory

Timeline

Published: Nov 30, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4242?

How severe is CVE-2021-4242?

CVE-2021-4242 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 3.02% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4242?

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-2021-4242?

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

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Source: NVD / NIST