CVE-2026-6240: CWE-121 Stack-based buffer overflow in TP-Link Systems Inc. Tapo C520WS v2
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.
AI Analysis
Technical Summary
CVE-2026-6240 is a stack-based buffer overflow vulnerability in TP-Link Systems Inc.'s Tapo C520WS v2 device. The vulnerability is located in the ONVIF DeleteUsers service, where boundary checks are insufficient when handling multiple user deletion parameters. An attacker with authentication privileges can send a malicious request containing an excessive number of user identifiers, causing stack memory overflow. This can lead to a service crash or deadlock, resulting in denial of service conditions that impair device management and monitoring functionalities. The CVSS 4.0 base score is 6.8, indicating a medium severity level. There is no vendor advisory or patch currently available, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation may cause the device's management and monitoring services to crash or become unresponsive due to stack memory corruption. This results in denial of service, preventing legitimate management operations on the affected device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is available, restrict authenticated access to the ONVIF DeleteUsers service to trusted users only to reduce risk. Monitor for updates from TP-Link regarding remediation.
CVE-2026-6240: CWE-121 Stack-based buffer overflow in TP-Link Systems Inc. Tapo C520WS v2
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.
CVSS v4.0
Score 6.8medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6240 is a stack-based buffer overflow vulnerability in TP-Link Systems Inc.'s Tapo C520WS v2 device. The vulnerability is located in the ONVIF DeleteUsers service, where boundary checks are insufficient when handling multiple user deletion parameters. An attacker with authentication privileges can send a malicious request containing an excessive number of user identifiers, causing stack memory overflow. This can lead to a service crash or deadlock, resulting in denial of service conditions that impair device management and monitoring functionalities. The CVSS 4.0 base score is 6.8, indicating a medium severity level. There is no vendor advisory or patch currently available, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation may cause the device's management and monitoring services to crash or become unresponsive due to stack memory corruption. This results in denial of service, preventing legitimate management operations on the affected device.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is available, restrict authenticated access to the ONVIF DeleteUsers service to trusted users only to reduce risk. Monitor for updates from TP-Link regarding remediation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- TPLink
- Date Reserved
- 2026-04-13T17:10:23.938Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a23675be29bf47b50dbe8d8
Added to database: 06/06/2026, 00:18:35 UTC
Last enriched: 06/13/2026, 09:53:32 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 97
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