CVE-2025-3663

A3700r Firmware vulnerability

CVSS

5.3

EPSS

10.3%

EPSS pct

95th

Exploited

No known

A vulnerability, which was classified as critical, has been found in TOTOLINK A3700R 9.1.2u.5822_B20200513. This issue affects the function setWiFiEasyCfg/setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi of the component Password Handler. The manipulation leads to improper access controls. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected vendor

Totolink

Affected product

A3700r Firmware

CVSS vector

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

Weakness type (CWE)

CWE-266
CWE-284 — Improper Access Control

Published

2025-04-16

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to low impact to integrity.

Its EPSS score of 10.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 95% of all scored CVEs.

Check your external exposure to CVE-2025-3663

Confirm whether Totolink A3700r Firmware is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2025-3663.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2025-3663

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2025-3663 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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