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Netmodule Router SoftwarePlugin / extension · Netmodule

CVE-2021-39289

HIGH · 7.5 CVSS v3.1 Published 2021-08-23
Fix available
A fix is available. Upgrade to 4.3.0.113 / 4.4.0.111 or later.
See remediation →
84/100
Remediation priority · High
Public exploit 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
Certain NetModule devices have Insecure Password Handling (cleartext or reversible encryption), These models with firmware before 4.3.0.113, 4.4.0.111, and 4.5.0.105 are affected: NB800, NB1600, NB1601, NB1800, NB1810, NB2700, NB2710, NB2800, NB2810, NB3700, NB3701, NB3710, NB3711, NB3720, and NB3800.

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
How this class of weakness works · CWE-522

Credentials are stored or transmitted without adequate protection, so an attacker who reaches them can reuse them directly. One weak link here can unravel an entire system. Remediation means strong hashing for stored secrets, encryption in transit, and never writing credentials to logs.

General guidance for the insufficiently protected credentials class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Netmodule Router SoftwarePlugin / extension
Affected:< 4.3.0.113>= 4.4.0.0, < 4.4.0.111>= 4.5.0.0, < 4.5.0.105

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
None
Availability
None

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

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 · scoped
Upgrade available Upgrade to 4.3.0.113 / 4.4.0.111 / 4.5.0.105 or later
Fixed in 4.3.0.1134.4.0.1114.5.0.105
Recommended fix High confidence

Upgrade to firmware 4.3.0.113 (for pre-4.3 installs), 4.4.0.111 (for 4.4.x branch), or 4.5.0.105 (for 4.5.x branch) - choose the appropriate version based on your current branch

  1. 1. Identify the current firmware version installed on the NetModule device by accessing the web interface or using the CLI
  2. 2. Determine which version branch the current firmware belongs to (pre-4.3, 4.4.x, or 4.5.x)
  3. 3. Download the appropriate fixed firmware version from NetModule's official support portal or from www.netmodule.com
  4. 4. For firmware versions < 4.3.0.113, upgrade to version 4.3.0.113 or later
  5. 5. For firmware versions >= 4.4.0.0 and < 4.4.0.111, upgrade to version 4.4.0.111 or later
  6. 6. For firmware versions >= 4.5.0.0 and < 4.5.0.105, upgrade to version 4.5.0.105 or later
  7. 7. Upload the firmware file through the device's web interface or via CLI using the firmware update function
  8. 8. After upgrade, verify the new firmware version is installed and confirm the password handling has been secured

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,250. Get the upgrade done

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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-2021-39289 in production — separate from our analysis above.

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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
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