Is CVE-2025-3987 actively exploited?

Yes. KEV Intelligence tracks CVE-2025-3987 as a known exploited vulnerability. Confidence is high.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2025-3987. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2025-3987 affects TOTOLINK N150RT. Reported affected version: 3.4.0-B20190525.

No. CVE-2025-3987 is not currently listed in CISA KEV.

Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2025-3987

TOTOLINK N150RT formWsc command injection

TOTOLINK / N150RT · 3.4.0-B20190525

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Severity: CVSS 5.3 · Medium
Confidence: High
Exploit status: Exploited in the wild
EPSS: 9.7%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-3987 is TOTOLINK N150RT formWsc command injection. A vulnerability was found in TOTOLINK N150RT 3.4.0-B20190525. It has been rated as critical. This issue affects some unknown processing of the file...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is high.

Who is affected?

TOTOLINK / N150RT 3.4.0-b20190525.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

A vulnerability was found in TOTOLINK N150RT 3.4.0-B20190525

A vulnerability was found in TOTOLINK N150RT 3.4.0-B20190525. It has been rated as critical. This issue affects some unknown processing of the file /boafrm/formWsc. The manipulation of the argument localPin leads to command injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.

Eine Schwachstelle wurde in TOTOLINK N150RT 3.4.0-B20190525 ausgemacht. Sie wurde als kritisch eingestuft. Betroffen davon ist ein unbekannter Prozess der Datei /boafrm/formWsc. Mittels Manipulieren des Arguments localPin mit unbekannten Daten kann eine command injection-Schwachstelle ausgenutzt werden. Die Umsetzung des Angriffs kann dabei über das Netzwerk erfolgen. Der Exploit steht zur öffentlichen Verfügung.

Vendor Product Affected Status

TOTOLINK N150RT 3.4.0-B20190525 Affected

View vendor advisory

Published: 27 Apr 2025
Exploitation Reported: 27 Apr 2025
Attack vector: Remote
Complexity: Low
Privileges: Low
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-3987
Submit #557938 | TOTOLINK N150RT V3.4.0-B20190525 Command Injection vuldb.com · Third-Party Advisory https://vuldb.com/?submit.557938
GitHub — fizz-is-on-the-way/Iot_vuls github.com · Exploit https://github.com/fizz-is-on-the-way/Iot_vuls/tree/main/N150RT/RCE_f...
VDB-306323 | TOTOLINK N150RT formWsc command injection vuldb.com · Technical Description https://vuldb.com/?id.306323
Product — totolink.net totolink.net · Product https://www.totolink.net/
VDB-306323 | CTI Indicators (IOB, IOC, TTP, IOA) vuldb.com · Signature https://vuldb.com/?ctiid.306323

Exploitation evidence

Why KEV Intelligence 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

The Shadowserver

Recorded 27 Apr 2025

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

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

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Source	Added
The Shadowserver First	2025-04-27 21:31 UTC

Detection

Operational artifacts and observed signals

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

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

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

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

5.3 Medium

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

EPSS

9.7%

Weaknesses

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE-74 Improper Neutralization of Special Elements used in a Command ('Command Injection') CWE-77

All CVSS Scores

CVSS v4.0 5.3 Medium

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

CVSS v3.1 6.3 Medium

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

CVSS v3.0 6.3 Medium

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS v2.0 6.5 Medium

AV:N/AC:L/Au:S/C:P/I:P/A:P

Timeline

From disclosure to observed exploitation

27 Apr 2025
CVE published

Vulnerability disclosed publicly
27 Apr 2025
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
26 Apr 2025
CVE ID reserved

Identifier reserved by the CNA

Pro API

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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-2025-3987

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2025-3987",
  "confidence": "High",
  "cvss_score": 5.3,
  "cvss_estimated": false,
  "epss_score": 0.09713,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

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