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PatchSiren cyber security CVE debrief

CVE-2026-6240 TP-Link Systems Inc. CVE debrief

A stack-based buffer overflow vulnerability exists in Tapo C520WS v2 in the ONVIF DeleteUsers service, due to insufficient boundary checks when handling multiple user deletion parameters. An authenticated attacker can send a crafted malicious request containing an excessive number of identifiers to overflow stack memory. Successful exploitation may result in a service crash or deadlock, leading to DoS affecting device management and monitoring functionality.

Vendor
TP-Link Systems Inc.
Product
Tapo C520WS v2
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-06
Original CVE updated
2026-07-23
Advisory published
2026-06-06
Advisory updated
2026-07-23

Who should care

Users of Tapo C520WS v2 should apply patches or mitigations to prevent exploitation.

Technical summary

The vulnerability has a CVSS score of 6.8 and is classified as MEDIUM severity. It was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-6240) and last modified on [cveModifiedAt](https://nvd.nist.gov/vuln/detail/CVE-2026-6240).

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply patches or updates provided by the vendor.
  • Restrict access to the ONVIF DeleteUsers service.
  • Monitor device management and monitoring functionality for anomalies.

Evidence notes

The vendor is likely Tp Link, based on the provided evidence.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6240 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6240

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-6240 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6240

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.tp-link.com/en/support/download/tapo-c520ws/

    f23511db-6c3e-4e32-a477-6aa17d310630

  • Source reference

    Unverified legacy reference

    URL: https://www.tp-link.com/us/support/download/tapo-c520ws/

    f23511db-6c3e-4e32-a477-6aa17d310630

  • Source reference

    Unverified legacy reference

    URL: https://www.tp-link.com/us/support/faq/5120/

    f23511db-6c3e-4e32-a477-6aa17d310630

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.