CVE-2026-6239Authenticated Stack-based Buffer Overflow in ONVIF CreateUsers Service in TP-Link Tao C520WS
Updated under an hour ago ()
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It affects TP-Link Systems Inc. Tapo C520WS v2. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 6.8 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-121
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- TPLink
- NVD analysis
- Deferred
- Record last updated
- Jun 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
TP-Link Systems Inc. Tapo C520WS v2 tp_link_systems:tapo_c520ws_v2 (from the name) | before 1.2.6 Build 260528 | CNA record |
References
- https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notespatch
- https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notespatch
- https://www.tp-link.com/us/support/faq/5120/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.