Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2021-3708

DSL-2750U Command Injection

D-Link / DSL-2750U · firmware vME1.16 or prior versions

Watch CVE-2021-3708 Browse KEV feed
Severity
CVSS 7.8 · High
Confidence
High
Exploit status
Exploited in the wild
EPSS
24.6%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-3708 is a vulnerability affecting D-Link DSL-2750U. D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to OS command injection. An unauthenticated attacker on the local network may...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

D-Link / DSL-2750U firmware vme1.16 or prior versions.

What should we do?

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

Overview

D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to OS command injection

D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to OS command injection.

An unauthenticated attacker on the local network may exploit this, with CVE-2021-3707, to execute any OS commands on the vulnerable device.

D-Link Affected
DSL-2750U
firmware vME1.16 or prior versions
View vendor advisory (opens in new tab)
Published
16 Aug 2021
Exploitation Reported
16 Jan 2026
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None

CVE References

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

The Shadowserver

Recorded 16 Jan 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

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

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Source Added
The Shadowserver First 2026-01-16 00:00 UTC

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
0
0
0

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.

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 v3.1

7.8 High

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

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

EPSS

24.6%

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

Weaknesses

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE-78

All CVSS Scores

CVSS v3.1 7.8 High

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

CVSS v2.0 7.2 High

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

Timeline

From disclosure to observed exploitation

  1. 00:00 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  2. 04:55 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 00:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

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-2021-3708

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2021-3708",
  "confidence": "High",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.24563,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}