Adjacent UPnP service interruption via unvalidated input
Published Nov 20, 2025 · Updated Nov 20, 2025
Improper input validation in the TP-Link TL-WR940N V6 UPnP modules through Build 220801 allows attackers to interrupt the UPnP service. TP-Link has not disclosed which UPnP request field is accepted without validation or how processing that input makes the service unavailable. Exploitation requires no authentication or user interaction but does require access to the router's adjacent network; the documented impact is limited to loss of the UPnP service.
Summary
What happened
Improper input validation in the TP-Link TL-WR940N V6 UPnP modules through Build 220801 allows attackers to interrupt the UPnP service. TP-Link has not disclosed which UPnP request field is accepted without validation or how processing that input makes the service unavailable. Exploitation requires no authentication or user interaction but does require access to the router's adjacent network; the documented impact is limited to loss of the UPnP service.
The record
- CVE
- CVE-2025-11676
- Published
- Nov 20, 2025
- Updated
- Nov 20, 2025
- Vendor
- TP-Link Systems Inc.
- Product
- TL-WR940N
- Classifications
- CWE-20, T1499.004
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 20, 2025CVE publishedPublication date reported by the CVE source.
- Nov 20, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <=Build 220801
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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