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PatchSiren cyber security CVE debrief

CVE-2026-6241 TP-Link Systems Inc. CVE debrief

CVE-2026-6241 is an authenticated format string vulnerability in the ONVIF AddScopes of Tapo C520WS v2. User-controlled input is improperly passed to formatting functions without adequate sanitization. An attacker can inject format specifiers into ONVIF scope parameters to manipulate memory handling behavior. Successful exploitation may cause the ONVIF management service to crash, resulting in a DoS condition that impacts normal device operation.

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

Administrators and users of Tapo C520WS v2 devices should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The vulnerability has a CVSS score of 6.8 and is classified as MEDIUM severity. The CVSS vector is CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update to the latest firmware version as available from the vendor.
  • Restrict access to the ONVIF management service to only trusted users and networks.
  • Monitor device 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-2026-6241 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-6241

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

  • CVE-2026-6241 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-6241

    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.