CVE-2022-4874: netcomm nf20 Improper Authentication

Vulnerability summary

CVE-2022-4874 is a high (CVSS 7.5) Improper Authentication vulnerability in netcomm nf20. EPSS estimates a 11.01% chance of exploitation in the next 30 days, higher than 95.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 11-01-2023
   PublishedVulnerability first disclosed.
2. 04-11-2025
   Last modifiedVulnerability information updated.

Description

Authentication bypass in Netcomm router models NF20MESH, NF20, and NL1902 allows an unauthenticated user to access content. In order to serve static content, the application performs a check for the existence of specific characters in the URL (.css, .png etc). If it exists, it performs a "fake login" to give the request an active session to load the file and not redirect to the login page.

• CWE-287Improper AuthenticationWhen an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.