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Dir 882 FirmwareOperating system · Dlink

CVE-2021-44881

CRITICAL · 9.8 CVSS v3.1 Published 2022-02-04
Fix available
A fix is available. Upgrade to after 1.30b06 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
D-Link device DIR_882 DIR_882_FW1.30B06_Hotfix_02 was discovered to contain a command injection vulnerability in the twsystem function. This vulnerability allows attackers to execute arbitrary commands via a crafted HNAP1 POST request.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

D-Link DIR_882 router firmware DIR_882_FW1.30B06_Hotfix_02 contains a command injection vulnerability in the twsystem function. Attackers can execute arbitrary commands by sending a crafted HNAP1 POST request to the affected device, potentially gaining full control of the router.

MitigationApply the vendor-provided firmware patch when available; until then, restrict network access to the router's management interface and monitor for suspicious HNAP1 requests.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Dir 882 FirmwareOperating system
Affected:<= 1.30b06= 1.30b06

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify router firmware version
    Log into the router web interface and navigate to Status or System Info page to view the firmware version, or use the command 'cat /proc/version' via telnet/SSH if available
    Affected if Firmware version is 1.30b06 or any version lower than 1.30b06 (e.g., 1.30b05, 1.30b04)
  2. Verify HNAP1 service is accessible
    Send an HTTP POST request to http://<router-ip>/HNAP1/ with any valid SOAP action header; a 200 response indicates the service is enabled
    Affected if HNAP1 endpoint responds with HTTP 200, meaning the service is enabled and reachable
  3. Confirm management interface network exposure
    Check if the router's web interface (port 80/443) is exposed to the internet or an untrusted network by reviewing firewall rules or attempting external access
    Affected if The router management interface is accessible from untrusted networks (not just local LAN)

A user is affected if their D-Link DIR-882 is running firmware version 1.30b06 or below AND the HNAP1 service is accessible on their network.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to a release after 1.30b06
Interim mitigation

Apply the vendor-provided firmware patch when available; until then, restrict network access to the router's management interface and monitor for suspicious HNAP1 requests.

Fix this in Dir 882 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-44881 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data