CVE-2021-4242: sapido br270n_firmware Improper Neutralization

Vulnerability summary

CVE-2021-4242 is a high (CVSS 8.8) Improper Neutralization vulnerability in sapido br270n_firmware. EPSS estimates a 3.09% chance of exploitation in the next 30 days, higher than 87.5% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 30-11-2022
   PublishedVulnerability first disclosed.
2. 15-04-2025
   Last modifiedVulnerability information updated.

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.

• CWE-707Improper NeutralizationThe product does not ensure or incorrectly ensures that structured messages or data are well-formed and that certain security properties are met before being read from an upstream component or sent to a downstream component.
• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.