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Vulnerability Details :

CVE-2026-6240

Summary
Assigner-TPLink
Assigner Org ID-f23511db-6c3e-4e32-a477-6aa17d310630
Published At-05 Jun, 2026 | 23:51
Updated At-05 Jun, 2026 | 23:51
Rejected At-
Credits

Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C520WS

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:TPLink
Assigner Org ID:f23511db-6c3e-4e32-a477-6aa17d310630
Published At:05 Jun, 2026 | 23:51
Updated At:05 Jun, 2026 | 23:51
Rejected At:
▼CVE Numbering Authority (CNA)
Authenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C520WS

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.

Affected Products
Vendor
TP-Link Systems Inc.
Product
Tapo C520WS v2
Default Status
unaffected
Versions
Affected
  • From 0 before 1.2.6 Build 260528 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-121CWE-121 Stack-based buffer overflow
Type: CWE
CWE ID: CWE-121
Description: CWE-121 Stack-based buffer overflow
Metrics
VersionBase scoreBase severityVector
4.06.8MEDIUM
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
Version: 4.0
Base score: 6.8
Base severity: 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
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-100CAPEC-100 Overflow Buffers
CAPEC ID: CAPEC-100
Description: CAPEC-100 Overflow Buffers
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes
patch
https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes
patch
https://www.tp-link.com/us/support/faq/5120/
vendor-advisory
Hyperlink: https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes
Resource:
patch
Hyperlink: https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes
Resource:
patch
Hyperlink: https://www.tp-link.com/us/support/faq/5120/
Resource:
vendor-advisory
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:f23511db-6c3e-4e32-a477-6aa17d310630
Published At:06 Jun, 2026 | 00:16
Updated At:06 Jun, 2026 | 00:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.06.8MEDIUM
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
Type: Secondary
Version: 4.0
Base score: 6.8
Base severity: 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/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
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-121Secondaryf23511db-6c3e-4e32-a477-6aa17d310630
CWE ID: CWE-121
Type: Secondary
Source: f23511db-6c3e-4e32-a477-6aa17d310630
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notesf23511db-6c3e-4e32-a477-6aa17d310630
N/A
https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notesf23511db-6c3e-4e32-a477-6aa17d310630
N/A
https://www.tp-link.com/us/support/faq/5120/f23511db-6c3e-4e32-a477-6aa17d310630
N/A
Hyperlink: https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes
Source: f23511db-6c3e-4e32-a477-6aa17d310630
Resource: N/A
Hyperlink: https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes
Source: f23511db-6c3e-4e32-a477-6aa17d310630
Resource: N/A
Hyperlink: https://www.tp-link.com/us/support/faq/5120/
Source: f23511db-6c3e-4e32-a477-6aa17d310630
Resource: N/A

Change History

0
Information is not available yet

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