Netgear DGND3700 Basic Authentication BRS_top.html improper authentication

published 2025-05-20 last yr. modified 2026-06-17 4mo ago also EUVD-2025-15826

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 21.6%; EPSS 21.6% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known

A vulnerability, which was classified as very critical, was found in Netgear DGND3700 1.1.00.15_1.00.15NA. This affects an unknown part of the file /BRS_top.html of the component Basic Authentication. The manipulation leads to improper authentication. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. Other products might be affected as well. The vendor was contacted early about this disclosure.

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CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: total
Assessed: last yr. (2025-05-20)

Exploit prediction

21.60% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/at0de/my_vulns/blob/main/Netgear/DGND3700v2/backdoor.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/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:X/V:X/RE:X/U:X

Affected products

Netgear DGND3700

Classification

Weakness

CWE-287 Improper Authentication

References

github.com /at0de/my_vulns/blob/main/Netgear/DGND3700v2/backdoor.md
exploit
vuldb.com /?id.309639
vdb-entry, third-party-advisory
vuldb.com /?ctiid.309639
signature, permissions-required, vdb-entry
vuldb.com /?submit.564712
third-party-advisory, vdb-entry
netgear.com /
product

Sources

CVE List CVE-2025-4978
NVD CVE-2025-4978

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

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