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Vulnerability record · CVE-2026-35019 · published 23 June 2026

CVE-2026-35019: NetComm NF20MESH routers running firmware R6B031 and earlier contain an authentication bypass vulnerability th…

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.

9.2 CVSS 4.0 Critical EPSS 0.81% · top 45.0% CWE-321 · CWE-321 Deferred
9.2CVSS 4.0 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
23 Jun 2026Last modified by NVD

Description

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/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://signal11.io/advisories/netcomm-nf20-mesh-authentication-bypass
https://support.netcommwireless.com/api/Media/Firmware/4407c21d-e990-49a4-9754-b72475f20c76?Product=NF20MESH%20Release%2
https://support.netcommwireless.com/products/nf20mesh#Firmware
https://www.vulncheck.com/advisories/netcomm-nf20mesh-r6b032-hardcoded-aes-key-authentication-bypass

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Source: NIST National Vulnerability Database (record CVE-2026-35019), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.