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CVE-2021-45382 (GCVE-0-2021-45382)

Vulnerability from cvelistv5 – Published: 2022-02-17 20:07 – Updated: 2025-10-21 23:15
VLAI CISA Shadowserver Previdian
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-29 20:55 UTC
CWE
  • n/a
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4aea3dc8-16fa-4cd1-8236-88eb0052c574

Vulnerability ID: CVE-2021-45382

Status: Confirmed

Status Updated: 2022-04-04 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-04-04
Asserted: 2022-04-04
Scope
Notes: KEV entry: D-Link Multiple Routers Remote Code Execution Vulnerability | Affected: D-Link / Multiple Routers | Description: A remote code execution vulnerability exists in all series H/W revisions routers via the DDNS function in ncc2 binary file. | Required action: The impacted product is end-of-life and should be disconnected if still in use. | Due date: 2022-04-25 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-45382
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-78
Feed CISA Known Exploited Vulnerabilities Catalog
Product Multiple Routers
Due Date 2022-04-25
Date Added 2022-04-04
Vendorproject D-Link
Vulnerabilityname D-Link Multiple Routers Remote Code Execution Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 13:25 UTC | Updated: 2026-02-06 07:53 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 45b51f67-15c1-4c1d-8b23-929db68464d7

Vulnerability ID: CVE-2021-45382

Status: Confirmed

Status Updated: 2026-09-06 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2023-10-13
Asserted: 2023-10-13
Last Seen: 2026-09-06
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: D-Link / DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, DIR-836L | Class: router | Severity: Critical (CVSS 9.8) | IoT: yes | In CISA KEV: yes | Honeypot connections on 2026-09-06: 34
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 3
Iot yes
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class router
7D Avg 2
Vendor D-Link
30D Avg 1
90D Avg 2
Product DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, DIR-836L
Cisa Kev yes
Connections 34
Observation Date 2026-09-06
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-07-01 05:53 UTC | Updated: 2026-09-08 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 15a16d96-79ef-42f7-b724-6bc3195d720f

Vulnerability ID: CVE-2021-45382

Status: Confirmed

Status Updated: 2022-04-04 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-04-04
Asserted: 2022-04-04
Scope
Notes: KEVIntel entry: 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... | Affected: D-link / DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, DIR-836L routers | CVSS: 9.8 (CRITICAL) | EPSS: 0.97836 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor D-link
Product DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, DIR-836L routers
Added Date 2022-04-04T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.97836
Cvss Severity CRITICAL
Epss Percentile 0.99898
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 11:13 UTC | Updated: 2026-06-23 11:13 UTC
Show details on NVD website
To clipboard 

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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.