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Vx800v FirmwareOperating system · Tp Link

CVE-2025-15542

MEDIUM · 5.3 CVSS v3.1 Published 2026-01-29
Fix available
A fix is available. Upgrade to 800.0.12 or later.
See remediation →
62/100
Remediation priority · Elevated
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
Improper handling of exceptional conditions in VX800v v1.0 in SIP processing allows an attacker to flood the device with crafted INVITE messages, blocking all voice lines and causing a denial of service on incoming calls.

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 confidence

The VX800v v1.0 VoIP device fails to properly handle exceptional conditions when processing SIP INVITE messages, allowing attackers to flood the device with crafted INVITE packets. This exhausts resources and blocks all voice lines, causing a denial of service for incoming calls.

MitigationImplement rate limiting or access control lists on the network edge to restrict SIP INVITE traffic volume, and consider network segmentation to isolate the VoIP device from untrusted networks.

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
Vx800v FirmwareOperating system
Affected:< 800.0.12

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
None
Integrity
None
Availability
Low

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

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. Check the device firmware version
    Access the TP-Link VX800v admin interface or check via SNMP/TFTP/console, and run 'show version' or view the firmware version in the web UI under Status or System settings
    Affected if The firmware version is below 800.0.12 (e.g., 800.0.11, older versions)
  2. Verify if the SIP service is enabled
    In the device web interface, navigate to VoIP or Phone settings and check if SIP functionality is turned on
    Affected if SIP service is enabled and the device is processing SIP traffic
  3. Confirm the device is exposed to SIP network traffic
    Check the device's firewall/NAT settings and determine if UDP/TCP port 5060 (SIP) is open to untrusted networks or the internet
    Affected if Port 5060 is accessible from external networks without adequate filtering
  4. Review device resource usage logs
    Check system logs or SNMP counters for signs of CPU/memory exhaustion or abnormally high call setup activity
    Affected if Logs show repeated SIP INVITE messages or resource depletion patterns

The device is affected if it runs TP-Link VX800v firmware version below 800.0.12 and has SIP service enabled with exposure to untrusted SIP traffic.

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 800.0.12 or later
Fixed in 800.0.12
Interim mitigation

Implement rate limiting or access control lists on the network edge to restrict SIP INVITE traffic volume, and consider network segmentation to isolate the VoIP device from untrusted networks.

Recommended fix High confidence

800.0.12 or later

  1. 1. Identify the current firmware version of the Vx800v device by accessing the web management interface or using the device's status page.
  2. 2. Navigate to the official TP-Link support page at www.tp-link.com and locate the Vx800v firmware download section.
  3. 3. Download the latest available firmware version (800.0.12 or later) from TP-Link's official support page.
  4. 4. Access the device's administration panel and locate the firmware upgrade section (typically under System Tools > Firmware Upgrade).
  5. 5. Upload the downloaded firmware file and initiate the upgrade process.
  6. 6. Wait for the upgrade to complete and verify the device restarts successfully.
  7. 7. Confirm the new firmware version is installed by checking the device status page.
Caveat Review TP-Link release notes for any configuration or feature changes before upgrading

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

Fix this in Vx800v 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-2025-15542 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
  • No spam, self-promotion, credentials, or personal data