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Varaxon Technologies

Known exploited vulnerability · CISA KEV

CVE-2021-45382: D-Link Multiple Routers Remote Code Execution Vulnerability

A remote code execution vulnerability exists in all series H/W revisions routers via the DDNS function in ncc2 binary file.

CVE-2021-45382

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2022-04-04: attackers are using it right now.

CISA KEV
Listed
Added 2022-04-04 · federal fix-by 2022-04-25
EPSS (30 days)
98%
Higher than 99.9% of CVEs · 2026-11-01
CVSS
No score

What CISA says

D-Link Multiple Routers Remote Code Execution Vulnerability

The impacted product is end-of-life and should be disconnected if still in use.

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How to check if you are exposed to CVE-2021-45382

  1. Find every D-Link Multiple Routers system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2021-45382.

US federal agencies had to fix this by 2022-04-25. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

  1. · Added to CISA's Known Exploited Vulnerabilities catalog
  2. · Fix-by date for US federal agencies, passed 1,651 days ago

Weakness type

More exploited D-Link vulnerabilities

CISA lists 26 exploited D-Link vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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