dbcve.org
Gs1900 48hpv2 FirmwareOperating system · Zyxel

CVE-2024-38270

MEDIUM · 6.5 CVSS v3.1 Published 2024-09-10
Fix available
A fix is available. Upgrade to 2.80 or later.
See remediation →
70/100
Remediation priority · Elevated
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
An insufficient entropy vulnerability caused by the improper use of a randomness function with low entropy for web authentication tokens generation exists in the Zyxel GS1900-10HP firmware version V2.80(AAZI.0)C0. This vulnerability could allow a LAN-based attacker a slight chance to gain a valid session token if multiple authenticated sessions are alive.

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

The Zyxel GS1900-10HP switch firmware V2.80(AAZI.0)C0 uses a low-entropy randomness source when generating web authentication session tokens. A LAN-based attacker with proximity to the network can attempt to brute-force or predict session tokens with a low probability of success when multiple authenticated sessions are active simultaneously.

MitigationApply vendor firmware update when available; until then, restrict management interface access to trusted networks/VLANs, use VPN for administrative access, and minimize the duration of concurrent authenticated sessions.

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
Gs1900 48hpv2 FirmwareOperating system
Affected:< 2.80\(abtq.1\)c0
Gs1900 48 FirmwareOperating system
Affected:< 2.80\(aahn.1\)c0
Gs1900 24hpv2 FirmwareOperating system
Affected:< 2.80\(abtp.1\)c0
Gs1900 24ep FirmwareOperating system
Affected:< 2.80\(abto.1\)c0
Gs1900 24e FirmwareOperating system
Affected:<= 2.80\(aahk.1\)c0
Gs1900 24 FirmwareOperating system
Affected:<= 2.80\(aahl.1\)c0
Gs1900 16 FirmwareOperating system
Affected:< 2.80\(aahj.1\)c0
Gs1900 10hp FirmwareOperating system
Affected:< 2.80\(aazi.1\)c0

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
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:A/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 checks

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

  1. Identify the device model
    Access the switch web interface or use SNMP to confirm the device is a Zyxel GS1900 series switch (including 10HP, 16, 24, 24E, 24EP, 24HPv2, 48, 48HPv2 models)
    Affected if Device is any GS1900 series model listed in the affected products
  2. Check the installed firmware version
    Navigate to the switch web interface under Administration > Firmware or use CLI command 'show system-info' to retrieve the firmware version and build number
    Affected if Firmware version is less than 2.80(abtq.1)c0 (48HPv2), 2.80(aahn.1)c0 (48), 2.80(abtp.1)c0 (24HPv2), 2.80(abto.1)c0 (24EP), 2.80(aahk.1)c0 (24E), 2.80(aahl.1)c0 (24), 2.80(aahj.1)c0 (16), or 2.80(aazi.1)c0 (10HP)
  3. Verify web authentication is enabled
    Check the switch configuration under Management > Web Authentication to confirm the web-based login feature is active
    Affected if Web authentication interface is enabled and accessible on the switch
  4. Confirm multiple concurrent sessions are possible
    Review switch settings or attempt to establish multiple authenticated web sessions from different clients to verify simultaneous sessions are permitted
    Affected if The switch allows multiple simultaneous authenticated web sessions to coexist

The environment is affected if the switch is a Zyxel GS1900 model running firmware version below the specified 2.80 threshold and the web authentication interface is accessible with support for concurrent sessions.

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.

dbcve · scoped
Upgrade available Upgrade to 2.80 or later
Fixed in 2.80
Interim mitigation

Apply vendor firmware update when available; until then, restrict management interface access to trusted networks/VLANs, use VPN for administrative access, and minimize the duration of concurrent authenticated sessions.

Recommended fix High confidence

Firmware version 2.80 or later for each respective GS1900 model

  1. 1. Identify the exact model of your Zyxel GS1900 switch from the affected list
  2. 2. Navigate to Zyxel support website (www.zyxel.com) and locate the firmware download section for your specific GS1900 model
  3. 3. Download the firmware version 2.80 or later for your model
  4. 4. Access the switch web management interface using an authenticated session
  5. 5. Navigate to the Administration > Firmware Upgrade section
  6. 6. Upload and apply the downloaded firmware file
  7. 7. Wait for the device to reboot and verify the new firmware version is installed
  8. 8. Ensure all affected devices in your network are upgraded
Caveat Review Zyxel release notes for any configuration or feature changes between your current version and 2.80 before upgrading

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

Fix this in Gs1900 48hpv2 Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing3.0 h
  • Review / QA2.0 h
8.0 hours of engineering $1,390
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,224.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2024-38270 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2024-38270 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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