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ExploitedNot in CISA KEV yet

CVE-2021-3708

Exploitation confirmed. First attested on 2023-10-20 by GCVE · kevintel, GCVE · shadowserver.

  • Published2021-08-16
  • WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-08-1605:15CVE publishedNVD
  2. 2023-10-2003:23Listed as exploited by GCVEGCVE
  3. 2023-10-2003:23Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-3708?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-3708?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Dlink dsl-2750u firmwareversion to verify
BranchAffectedFixed in
1.16≤ 1.16no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • GCVEexploitation2023-10-20
  • NVDCVSS 3.17.8read 2026-10-23
  • NVDCVSS 2.07.2read 2026-10-23
  • CNAweakness (CWE)CWE-78known since 2026-10-23
  • NVDweakness (CWE)CWE-78read 2026-10-23
  • FIRST EPSSEPSS score24.6 %read 2026-11-03

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-08-16
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-3708?

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.

Is CVE-2021-3708 actively exploited?

Active exploitation of CVE-2021-3708 has not been confirmed. Its EPSS score was 24.6% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3708?

CVE-2021-3708 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record