CVE-2021-45382
CriticalExploitedPublic exploitA Remote Command Execution (RCE) vulnerability exists in all series H/W revisions D-link DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L routers via the DDNS function in ncc2 binary file.
Published Feb 17, 2022 · Updated Nov 10, 2025
Key Facts
Patch immediately- CVE-2021-45382 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Dir-810l Firmware (Dlink), Dir-820l Firmware (Dlink), Dir-820lw Firmware (Dlink) and 3 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 1, 2022. Public exploit code is available.
- EPSS estimates a 98% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
98%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
A Remote Command Execution (RCE) vulnerability exists in all series H/W revisions D-link DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L routers via the DDNS function in ncc2 binary file. Note: DIR-810L, DIR-820L, DIR-830L, DIR-826L, DIR-836L, all hardware revisions, have reached their End of Life ("EOL") /End of Service Life ("EOS") Life-Cycle and as such this issue will not be patched.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Apr 4, 2022 | Apr 25, 2022 | Not reported |
| Industry KEV feed | Apr 1, 2022 | Apr 25, 2022 | Not reported |
| CIRCL KEV | Apr 4, 2022 | Apr 25, 2022 | Not reported |
| ENISA EUVD | Apr 4, 2022 | n/a | Not reported |
Required action: The impacted product is end-of-life and should be disconnected if still in use.
Affected Products
6 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Dir-810l FirmwareDlink | See advisory | n/a |
| Dir-820l FirmwareDlink | See advisory | n/a |
| Dir-820lw FirmwareDlink | See advisory | n/a |
| Dir-826l FirmwareDlink | See advisory | n/a |
| Dir-830l FirmwareDlink | See advisory | n/a |
Timeline
Publicly disclosed
Feb 17, 2022
Added to Industry KEV feed
Apr 1, 2022
Added to CISA KEV
Apr 4, 2022
Added to CIRCL KEV
Apr 4, 2022
Added to ENISA EUVD
Apr 4, 2022
Last updated
Nov 10, 2025
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10264
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
A Remote Command Execution (RCE) vulnerability exists in all series H/W revisions D-link DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L routers via the DDNS function in ncc2 binary file.
Affected: Dir-810l Firmware (Dlink); Dir-820l Firmware (Dlink); Dir-820lw Firmware (Dlink), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 1, 2022.
Yes. It was added on Apr 4, 2022 with a federal remediation due date of Apr 25, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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