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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-6240 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  TPLink
CVSS-B 6.8 MEDIUM
Vector:  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

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes TPLink
https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes TPLink
https://www.tp-link.com/us/support/faq/5120/ TPLink

Weakness Enumeration

CWE-ID CWE Name Source
CWE-121 Stack-based Buffer Overflow TPLink  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-6240
NVD Published Date:
06/05/2026
NVD Last Modified:
06/05/2026
Source:
TPLink