CVE-2026-6239: 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 CreateUsers service, where the device fails to properly validate the number of XML user nodes during request processing. An authenticated attacker can send a specially crafted ONVIF request containing an excessive number of user entries to trigger memory corruption. Successful exploitation may cause the ONVIF management service to terminate unexpectedly, resulting in a denial‑of‑service (DoS) condition that disrupts device configuration and management functions.
AI Analysis
Technical Summary
CVE-2026-6239 is a stack-based buffer overflow vulnerability in the ONVIF CreateUsers service of TP-Link Tapo C520WS v2. The vulnerability arises from improper validation of the number of XML user nodes during request processing. An attacker with authentication privileges can send a specially crafted ONVIF request containing an excessive number of user entries, triggering memory corruption. This can cause the ONVIF management service to terminate unexpectedly, leading to a denial-of-service condition that affects device configuration and management functions.
Potential Impact
Exploitation leads to denial-of-service by crashing the ONVIF management service, disrupting device configuration and management. No information about remote code execution or privilege escalation is provided. The attacker must be authenticated to exploit this vulnerability.
Mitigation Recommendations
No official patch or remediation is currently available for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is provided, restrict access to the ONVIF management interface to trusted users only and monitor for unusual activity requiring authentication.
CVE-2026-6239: 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 CreateUsers service, where the device fails to properly validate the number of XML user nodes during request processing. An authenticated attacker can send a specially crafted ONVIF request containing an excessive number of user entries to trigger memory corruption. Successful exploitation may cause the ONVIF management service to terminate unexpectedly, resulting in a denial‑of‑service (DoS) condition that disrupts device configuration and management functions.
CVSS v4.0
Score 6.8medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-6239 is a stack-based buffer overflow vulnerability in the ONVIF CreateUsers service of TP-Link Tapo C520WS v2. The vulnerability arises from improper validation of the number of XML user nodes during request processing. An attacker with authentication privileges can send a specially crafted ONVIF request containing an excessive number of user entries, triggering memory corruption. This can cause the ONVIF management service to terminate unexpectedly, leading to a denial-of-service condition that affects device configuration and management functions.
Potential Impact
Exploitation leads to denial-of-service by crashing the ONVIF management service, disrupting device configuration and management. No information about remote code execution or privilege escalation is provided. The attacker must be authenticated to exploit this vulnerability.
Mitigation Recommendations
No official patch or remediation is currently available for this vulnerability. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is provided, restrict access to the ONVIF management interface to trusted users only and monitor for unusual activity requiring authentication.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- TPLink
- Date Reserved
- 2026-04-13T17:10:22.074Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a23675be29bf47b50dbe8d3
Added to database: 06/06/2026, 00:18:35 UTC
Last enriched: 06/13/2026, 09:53:25 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 153
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