CVE-2021-26620
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 · uneditedAn improper authentication vulnerability leading to information leakage was discovered in iptime NAS2dual. Remote attackers are able to steal important information in the server by exploiting vulnerabilities such as insufficient authentication when accessing the shared folder and changing user’s passwords.
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 · moderate confidenceThe iptime NAS2dual NAS device contains an improper authentication vulnerability where remote attackers can exploit insufficient authentication checks to access shared folders and modify user passwords, leading to unauthorized information disclosure.
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< 1.4.82< 1.4.82< 1.4.82< 1.4.82< 1.4.82< 1.4.82< 1.4.82< 1.4.82CVSS 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
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 checksWork through these to decide whether this CVE applies to you.
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Identify iptime NAS modelAccess the NAS web management interface and locate the device information or system status page to confirm the exact model (Nas101, Nas1dual, Nas2dual, Nas3, Nas4, Nas4dual, Nas I, or Nas Ii).Affected if The device is any iptime NAS model listed in the affected products.
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Check installed firmware versionIn the NAS web interface, navigate to Settings > System > Firmware Update or System Information to view the current firmware version. Compare it against the affected version threshold of 1.4.82.Affected if The installed firmware version is below 1.4.82.
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Verify remote management access statusCheck the NAS network settings to determine if the web management interface (HTTP/HTTPS) is accessible from external networks. Look for options like Remote Access, Web Access, or Port Forwarding settings.Affected if Remote management or web access is enabled and the device is reachable from the internet.
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Confirm internet-facing exposureFrom an external network, attempt to access the NAS web interface using the public IP address or DDNS hostname configured on the device. Alternatively, check router port forwarding rules that may expose the NAS management ports.Affected if The NAS management interface is directly accessible from the internet without VPN or firewall filtering.
A user is affected if they are running any iptime NAS model with firmware version below 1.4.82 and have remote management enabled, allowing the device to be accessed from external networks.
Generated from the published advisory. Verify against your own configuration.
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.
dbcve · scoped1.4.82
Apply vendor firmware updates when available; until then, disable remote access to the NAS management interfaces and implement network segmentation to limit exposure.
Firmware 1.4.82 or later for the specific iptime NAS model
- 1. Identify the exact iptime NAS model (Nas101, Nas1dual, Nas2dual, Nas3, Nas4, Nas4dual, Nas I, or Nas Ii) from the affected device
- 2. Navigate to the iptime official support page or firmware download section
- 3. Download the firmware version 1.4.82 or later for the specific NAS model
- 4. Access the NAS device web management interface
- 5. Locate the firmware upgrade section (usually under System Settings or Administration)
- 6. Upload and apply the downloaded firmware file
- 7. Wait for the firmware update to complete and the device to reboot
- 8. Verify the firmware version has been updated to 1.4.82 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-26620 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-26620 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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