CVE-2021-3708
High PUBLISHEDD-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable to OS command injection. An unauthenticated attacker on the local...
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Aug 16, 2021
- Exploitation Reported
- Jan 16, 2026
- CVSS
- 7.8 High
- EPSS
- 24.6%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| D-Link |
DSL-2750U
|
firmware vME1.16 or prior versions |
Affected |
CVE References
- JVNVU#92088210: Multiple vulnerabilities in D-Link router DSL-2750U jvn.jp · Third-Party Advisory https://jvn.jp/en/vu/JVNVU92088210/
- GitHub — HadiMed/firmware-analysis github.com · CVE Record https://github.com/HadiMed/firmware-analysis/blob/main/DSL-2750U%20%2...
- supportannouncement.us.dlink.com/announcement/publication.aspx supportannouncement.us.dlink.com · CVE Record https://supportannouncement.us.dlink.com/announcement/publication.asp...
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2026-01-16 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L/AC:L/Au:N/C:C/I:C/A:C
Exploitation Status
Exploited in the wild
Recorded 2026-01-16 00:00:00 UTC · The Shadowserver
Weaknesses (CWE)
-
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC 6 months ago00:00 UTC · 6 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
04:55 UTC almost 5 years ago04:55 UTC · almost 5 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC almost 5 years ago00:00 UTC · almost 5 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2021-3708
{
"cve_id": "CVE-2021-3708",
"title": "D-Link router DSL-2750U with firmware vME1.16 or prior versions is vulnerable...",
"affected_vendor": "D-Link",
"affected_product": "DSL-2750U",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 7.8,
"epss_score": 0.24563,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}