How severe is CVE-2025-3663?

CVE-2025-3663 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-3663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-3663?

CVE-2025-3663 affects Totolink A3700r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-3663?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-3663 have an EU (EUVD) identifier?

Yes. CVE-2025-3663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11470.

When was CVE-2025-3663 published?

CVE-2025-3663 was published on 2025-04-16 and last updated on 2026-06-17.

CVE-2025-3663

CVE-2025-3663 is a medium-severity vulnerability in Totolink A3700r Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-266.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
CVSS v4: 6.9
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-11470
Weakness: CWE-266
Affected product: Totolink A3700r Firmware
Published: 2025-04-16
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-3663?: 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.
How severe is CVE-2025-3663?: CVE-2025-3663 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-3663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-3663?: CVE-2025-3663 affects Totolink A3700r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-3663?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-3663 have an EU (EUVD) identifier?: Yes. CVE-2025-3663 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11470.
When was CVE-2025-3663 published?: CVE-2025-3663 was published on 2025-04-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:a3700r_firmware:9.1.2u.5822_b20200513:*:*:*:*:*:*:*

More vulnerabilities in Totolink A3700r Firmware

CVE-2024-42545 — Critical (CVSS 9.8): TOTOLINK A3700R v9.1.2u.5822_B20200513 has a buffer overflow vulnerability in the ssid parameter in setWizardCfg…
CVE-2024-42543 — Critical (CVSS 9.8): TOTOLINK A3700R v9.1.2u.5822_B20200513 has a buffer overflow vulnerability in the http_host parameter in the loginauth…
CVE-2024-37637 — Critical (CVSS 9.8): TOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via ssid5g in the function…
CVE-2024-37635 — Critical (CVSS 9.8): TOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via ssid in the function…
CVE-2024-37634 — Critical (CVSS 9.8): TOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via ssid in the function…
CVE-2024-37632 — Critical (CVSS 9.8): TOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via the password parameter in function…

All CVEs affecting Totolink A3700r Firmware →

Other CWE-266 (Incorrect Privilege Assignment) vulnerabilities

CVE-2026-23800 — Critical (CVSS 10.0): Incorrect Privilege Assignment vulnerability in Modular DS modular-connector allows Privilege Escalation.This issue…
CVE-2025-41115 — Critical (CVSS 10.0): SCIM provisioning was introduced in Grafana Enterprise and Grafana Cloud in April to improve how organizations manage…
CVE-2024-9479 — Critical (CVSS 10.0): Improper Privilege Management vulnerability in upKeeper Solutions upKeeper Instant Privilege Access allows Privilege…
CVE-2024-9478 — Critical (CVSS 10.0): Improper Privilege Management vulnerability in upKeeper Solutions upKeeper Instant Privilege Access allows Privilege…
CVE-2026-42368 — Critical (CVSS 9.9): A privilege escalation vulnerability exists in the Web Interface functionality of GeoVision LPC2011/LPC2211 1.10. A…
CVE-2026-32922 — Critical (CVSS 9.9): OpenClaw before 2026.3.11 contains a privilege escalation vulnerability in device.token.rotate that allows callers with…

Browse all CWE-266 (Incorrect Privilege Assignment) vulnerabilities →