What’s Vulnerable › Vulnerabilities

CVE-2022-4874: Authenticated bypass in Netcomm router models NF20MESH, NF20, and NL1902 allows unauthenticated user to get access to content.

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-01-11 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Netcommwireless Nf20 Firmware: before r6b025 — fixed in r6b025
• Netcommwireless Nf20Mesh Firmware: before r6b025 — fixed in r6b025
• Netcommwireless Nl1902 Firmware: before r6b025 — fixed in r6b025

How to fix

Upgrade to a fixed version: Netcommwireless Nf20 Firmware r6b025; Netcommwireless Nf20Mesh Firmware r6b025; Netcommwireless Nl1902 Firmware r6b025. Check the vendor advisory for mitigations.

References

• https://github.com/scarvell/advisories/blob/main/2022_netcomm_nf20mesh_unauth_rce.md
• https://github.com/scarvell/advisories/blob/main/2022_netcomm_nf20mesh_unauth_rce.md
• https://www.kb.cert.org/vuls/id/986018

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