Authenticated service interruption via unbounded DeleteUsers identifiers
Published Jun 5, 2026 · Updated Jun 5, 2026
Stack-based buffer overflow in TP-Link Tapo C520WS v2 before 1.2.6 Build 260528 allows remote authenticated users to interrupt its ONVIF service. The DeleteUsers handler fails to bound the number of user identifiers in one ONVIF request before placing them in stack memory. Access requires a camera account and local-network reachability; exploitation crashes or deadlocks management and monitoring functions.
Summary
What happened
Stack-based buffer overflow in TP-Link Tapo C520WS v2 before 1.2.6 Build 260528 allows remote authenticated users to interrupt its ONVIF service. The DeleteUsers handler fails to bound the number of user identifiers in one ONVIF request before placing them in stack memory. Access requires a camera account and local-network reachability; exploitation crashes or deadlocks management and monitoring functions.
The record
- CVE
- CVE-2026-6240
- Published
- Jun 5, 2026
- Updated
- Jun 5, 2026
- Vendor
- TP-Link Systems Inc.
- Product
- Tapo C520WS
- Classifications
- T1499
- Attack vector
- adjacent
- Privileges
- admin
Timeline
How it unfolded
- Jun 5, 2026CVE publishedPublication date reported by the CVE source.
- Jun 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <1.2.6 Build 260528
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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