CVE-2026-6239: medium-severity vulnerability in TP-Link Systems Inc. Tapo C520WS v2
Authenticated Stack-based Buffer Overflow in ONVIF CreateUsers Service in TP-Link Tao C520WS
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.8epss 0.2%
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:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
TP-Link Systems Inc. · Tapo C520WS v2Related CVEs — TP-Link Systems Inc. Tapo C520WS v2
In the same product, most dangerous first.
CVE-2026-0918HIGHNull Pointer Dereference in Tapo SmartCam HTTP Service on TP-Link Tapo C220 & C520WSEPSS 0.7%CVE-2026-1315HIGHUnauthenticated Denial of Service via Firmware Update Endpoint on TP-Link Tapo C220 & C520WSEPSS 0.6%CVE-2026-0919HIGHUnauthenticated Denial of Service via Oversized URL in HTTP Parser on TP-Link Tapo C210, C220 & C520WSEPSS 0.6%CVE-2026-8714HIGHDenial-of-Service Vulnerability in RTSP Input Handling on TP-Link's Tapo C520WSEPSS 0.2%CVE-2026-6240MEDIUMAuthenticated Stack-based Buffer Overflow in ONVIF DeleteUsers Service on TP-Link Tapo C520WSEPSS 0.2%CVE-2026-6242MEDIUMAuthenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520WSEPSS 0.2%