What’s Vulnerable › Vulnerabilities

CVE-2026-76650: Pre-Authentication NULL Pointer Dereference in UPnP SOAP State Variable Query Processing in TP-Link TL-WR841N

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-09-01
• Weakness: CWE-476

Description

A NULL pointer dereference vulnerability exists in TL-WR841N v14 in the UPnP service when processing SOAP state variable query requests. A specially crafted SOAP query may trigger unexpected termination or instability of the process hosting the UPnP service. Successful exploitation may result in a denial-of-service condition affecting UPnP discovery, state query, or related management functionality until the affected process is restarted or the device is rebooted.

Affected products

• TP-Link System Inc. TL-WR841N v14: before TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478; before TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588 — fixed in TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588, TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478

How to fix

Upgrade to a fixed version: TP-Link System Inc. TL-WR841N v14 TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588, TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478. Check the vendor advisory for mitigations.

References

• https://www.tp-link.com/en/support/download/tl-wr841n/v14/#Firmware
• https://www.tp-link.com/us/support/download/tl-wr841n/v14/#Firmware
• https://www.tp-link.com/us/support/faq/5270/

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