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PatchSiren cyber security CVE debrief

CVE-2026-6242 TP-Link Systems Inc. CVE debrief

CVE-2026-6242 is a MEDIUM-severity vulnerability with a CVSS score of 6.8. The vulnerability exists in the ONVIF Subscribe service of Tapo C520WS v2 due to improper handling of externally supplied parameters within formatting functions. An authenticated attacker may inject crafted format strings into event subscription requests or notification generation paths to disrupt normal service execution, potentially causing the event notification service to terminate unexpectedly. This results in the loss of real-time alarm functionality and disruption of event notifications.

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 be aware of this vulnerability and take necessary actions to mitigate potential risks.

Technical summary

The vulnerability is caused by improper handling of externally supplied parameters within formatting functions in the ONVIF Subscribe service of Tapo C520WS v2. This allows an authenticated attacker to inject crafted format strings, potentially disrupting normal service execution.

Defensive priority

MEDIUM

Recommended defensive actions

  • Apply firmware updates from the vendor as available.
  • Restrict access to the ONVIF Subscribe service.
  • Monitor service logs for suspicious activity.

Evidence notes

The vendor is listed as Unknown Vendor, but evidence suggests the product is from Tp Link.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-6242 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6242

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

  • CVE-2026-6242 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6242

    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.