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TI-2026-05473 Aliases CVE-2026-6239GHSA-cpjh-84vm-rvxf

Authenticated Stack-based Buffer Overflow in ONVIF CreateUsers Service in TP-Link Tao C520WS

Priority LOW 29CWE-121Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0018 7th percentileScored 2026-11-07
Fix Fixed Tapo C520WS v2 (TP-Link Systems Inc.): 1.2.6 Build 260528

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TP-LinkTapo C520WS v2before 1.2.6 Build 2605281.2.6 Build 260528Patch availableCNA
  • Tapo C520WS v2 VendorTP-Link Affected before 1.2.6 Build 260528 Fixed in 1.2.6 Build 260528 Patch available CNA

Remediation

  • Fix · CNA Tapo C520WS v2 (TP-Link Systems Inc.) Fixed in 1.2.6 Build 260528

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    TP-Link Systems Tapo C520WS v2 — tp-link.com/us/support/faq/5120

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-26445 Whitelist Validation Bypass in TP-Link Tapo C520WSPriority LOW 30
    • TI-2026-05476 Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520WSPriority LOW 29
    • TI-2026-05475 Authenticated Format String Vulnerability in ONVIF AddScopes Method on TP-Link Tapo C520WSPriority LOW 29
    Show all 5 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-6239
  2. 2026-10-03 Alias added: GHSA-cpjh-84vm-rvxf

References

Patch 2

Advisory 1

  • TI-2023-16571 TP-Link TL-WR940N V2/V4, TL-WR841N V8/V10, and TL-WR740N V1/V2 was discovered to contain… KEVCVSS 3.1HIGH 8.8
  • TI-2023-01313 Command injection in TP-Link Archer AX21 KEVCVSS 3.1HIGH 8.8
  • TI-2020-14907 TP-Link TL-WA855RE V5 20200415-rel37464 devices allow an unauthenticated attacker (on the… KEVCVSS 3.1HIGH 8.8
  • TI-2025-08589 Authenticated RCE via Parental Control command injection KEVCVSS 4.0HIGH 8.6
  • TI-2015-02672 Directory traversal vulnerability in TP-LINK Archer C5 (1.2) with firmware before 150317… KEVCVSS 3.1HIGH 7.5
  • TI-2023-27456 Authentication bypass by spoofing in TP-Link TL-WR841N KEVCVSS 3.1MEDIUM 6.5
See all 636 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences