Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2025-3759

Missing Authentication for Changing Device Configuration in WF2220

Netis / WF2220

View live feed Monitor via API Watch CVE-2025-3759
Severity
CVSS 8.7 · High
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
0.2%
First observed
01 Oct 2026
Last observed
01 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-3759 is an unauthenticated Missing Authentication for Changing Device Configuration in WF2220. Endpoint /cgi-bin-igd/netcore_set.cgi which is used for changing device configuration is accessible without...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Netis / WF2220.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Missing Authentication for Changing Device Configuration in WF2220

Endpoint /cgi-bin-igd/netcore_set.cgi which is used for changing device configuration is accessible without authentication. This poses a significant security threat allowing for e.g: administrator account hijacking or AP password changing.

The vendor was contacted early about this disclosure but did not respond in any way.

Published
—
Exploitation Reported
01 Oct 2026
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None

CVE References

  • CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-3759

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Previdian

Recorded 01 Oct 2026

Previdian independently recorded this as exploited after first seeing it in honeypot sensors.

Active exploitation observed

Previdian sensor

First observed 01 Oct 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
Previdian Sensors First 2026-10-01 16:25 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

4

Attempts observed

1

Unique attacker IPs

1

Attacker countries

NL

1

Sensors observed

CVE-2025-3759 exploitation attempts over the last 7 days

Daily events observed by Previdian sensors

Updated 03 Oct 2026

0
0
0
0
4
0
0
27 Sep 28 Sep 29 Sep 30 Sep 1 Oct 2 Oct 3 Oct

First observed 01 Oct 2026 · Last observed 01 Oct 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
1
1
1

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

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Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Risk and context

Severity, weaknesses, and research context

CVSS v4.0

8.7 High

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

0.2%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Missing Authentication for Critical Function CWE-306

Timeline

From disclosure to observed exploitation

  1. 15:54 UTC

    Indicator of compromise added

    Indicators of compromise recorded

  2. 15:54 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-3759

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2025-3759",
  "confidence": "Confirmed",
  "cvss_score": 8.7,
  "cvss_estimated": false,
  "epss_score": 0.00249,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 4, "sensors": 1 }
}