Threats / D-Link / CVE-2021-45382
CVE-2021-45382
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
D-Link Multiple Routers vulnerability
Remote code execution in D-Link routers via DDNS function in ncc2 binary. Exploited in the wild with high EPSS score.
Verdict
Today item — known-exploited.
Unauthenticated remote attackers can execute arbitrary code on affected D-Link routers through the DDNS functionality. Active exploitation observed in the wild. Immediate patching recommended for all impacted hardware revisions.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
645 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-04).
Probability (EPSS)
EPSS 0.97836 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: D-Link, Multiple Routers. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-78 OS Command Injection — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
Probe router DDNS service for accessibility and version fingerprinting.
Business
Exposed DDNS interface increases attack surface and enables reconnaissance.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
Craft malicious input to ncc2 binary DDNS handler to trigger command injection.
Business
Arbitrary code execution allows attacker to establish persistent presence on network edge device.
3
Lateral reach — past segmentation narrative 3
Attacker
Execute commands with router privileges to modify configurations or deploy malware.
Business
Compromised router becomes pivot point for lateral network movement and data exfiltration.
4
Data at risk — exfiltration narrative 4
Attacker
Maintain access through backdoors or credential harvesting from connected devices.
Business
Long-term compromise of network perimeter undermines security posture and enables advanced threats.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05