CVE-2026-35019

NetComm NF20MESH routers running firmware R6B031 and earlier contain an authentication bypass vulnerability that allows unauthenticated attackers to gain administrative access by exploiting a hardcoded AES-256 key used to encrypt session cookies for the web management interface. Attackers can forge a valid encrypted session cookie using the shared hardcoded key and bypass authentication checks to obtain full administrative control of the management interface while any legitimate administrator session is active.

CVSS 4.0

9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-10-25)

CWE

CWE-321

Published

2026-06-23

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://signal11.io/advisories/netcomm-nf20-mesh-authentication-bypass
• https://support.netcommwireless.com/api/Media/Firmware/4407c21d-e990-49a4-9754-b72475f20c76?Product=NF20MESH%20Release%20Notes.pdf
• https://support.netcommwireless.com/products/nf20mesh#Firmware
• https://www.vulncheck.com/advisories/netcomm-nf20mesh-r6b032-hardcoded-aes-key-authentication-bypass

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