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

Quick assessment

Affected
TP-Link System Inc. TL-WR841N v14
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TP-Link TL-WR841N是中国TP-Link公司的一款家庭无线路由器。 TP-Link TL-WR841N v14 TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478之前版本和TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588之前版本存在异常处理不当漏洞，该漏洞源于UPnP服务处理SOAP状态变量查询请求时存在空指针解引用，特制SOAP查询可能触发进程意外终止或不稳定，成功利用可能导致拒绝服务，影响UPnP发现、状态

CVSS 5.3 · Medium EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
TP-Link System Inc. TL-WR841N v14 < TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478 affected
< TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588 affected
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I. Basic Information for CVE-2026-76650

Vulnerability Information
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Vulnerability Title
Pre-Authentication NULL Pointer Dereference in UPnP SOAP State Variable Query Processing in TP-Link TL-WR841N
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
TP-Link TL-WR841N 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TP-Link TL-WR841N是中国TP-Link公司的一款家庭无线路由器。 TP-Link TL-WR841N v14 TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478之前版本和TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588之前版本存在异常处理不当漏洞，该漏洞源于UPnP服务处理SOAP状态变量查询请求时存在空指针解引用，特制SOAP查询可能触发进程意外终止或不稳定，成功利用可能导致拒绝服务，影响UPnP发现、状态
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TP-Link System Inc. TL-WR841N v14 0 ~ TL-WR841N(US)_V14_4.19 Build 260820 Rel.33478 -

II. Public POCs for CVE-2026-76650

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III. Intelligence Information for CVE-2026-76650

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Vendor Advisories for CVE-2026-76650 (1)

Vendor Pages for CVE-2026-76650 (2)

Same Patch Batch · TP-Link System Inc. · 2026-08-28 · 3 CVEs total

CVE-2026-76651 5.3 MEDIUM Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N
CVE-2026-76649 5.3 MEDIUM Pre-Authentication NULL Pointer Dereference in UPnP SOAP Action Request Processing in TP-L

IV. Related Vulnerabilities

Same product: TL-WR841N v14
Same vendor: TP-Link System Inc.
Same weakness: CWE-476

V. Comments for CVE-2026-76650

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