Auth bypass in Netcomm Nf20
CVE-2022-4874
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.
Vulnerability class: Broken Authentication
EPSS: 0.110 (95.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Netcomm Nf20 — versions R6B025
- Netcomm Nf20mesh — versions R6B025
- Netcomm Nl1902 — versions R6B025
- Netcommwireless Nf20
- Netcommwireless Nf20_firmware
- Netcommwireless Nf20mesh
- Netcommwireless Nf20mesh_firmware
- Netcommwireless Nl1902
- Netcommwireless Nl1902_firmware
Weakness classification (CWE)
References
- cret@cert.org (Exploit, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2022-4874?
- CVE-2022-4874 is a high-severity vulnerability in Netcomm Nf20, classified under Improper Authentication. CVSS score: 7.5/10. Published 2023-01-11.
- How severe is CVE-2022-4874?
- High severity. CVSS v3 base score is 7.5 out of 10.