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CVE-2026-3622— Denial-of-Service Vulnerability in UPnP Component of TP Link's TL-WR841N

Quick assessment

Affected
TP-Link Systems 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是中国普联（TP-LINK）公司的一款无线路由器。 TP-LINK TL-WR841N v14 EN_0.9.1 4.19 Build 260303 Rel.42399n (V14_260303)之前版本和US_0.9.1.4.19 Build 260312 Rel. 49108n (V14_0304)之前版本存在安全漏洞，该漏洞源于UPnP组件输入验证不当导致越界读取，可能导致UPnP服务崩溃并引发拒绝服务。

AI Predicted 5.3 Difficulty: Easy EPSS 0.70% · P51

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-3622

Vulnerability Information
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Vulnerability Title
Denial-of-Service Vulnerability in UPnP Component of TP Link's TL-WR841N
Source: CVE Program / CVE List V5
Vulnerability Description
The vulnerability exists in the UPnP component of TL-WR841N v14, where improper input validation leads to an out-of-bounds read, potentially causing a crash of the UPnP service. Successful exploitation can cause the UPnP service to crash, resulting in a Denial-of-Service condition.  This vulnerability affects TL-WR841N v14 < EN_0.9.1 4.19 Build 260303 Rel.42399n (V14_260303) and < US_0.9.1.4.19 Build 260312 Rel. 49108n (V14_0304).
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:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
TP-LINK TL-WR841N 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TP-LINK TL-WR841N是中国普联（TP-LINK）公司的一款无线路由器。 TP-LINK TL-WR841N v14 EN_0.9.1 4.19 Build 260303 Rel.42399n (V14_260303)之前版本和US_0.9.1.4.19 Build 260312 Rel. 49108n (V14_0304)之前版本存在安全漏洞，该漏洞源于UPnP组件输入验证不当导致越界读取，可能导致UPnP服务崩溃并引发拒绝服务。
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 Systems Inc. TL-WR841N v14 0 ~ 0.9.1 4.19 -

II. Public POCs for CVE-2026-3622

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III. Intelligence Information for CVE-2026-3622

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Vendor Advisories for CVE-2026-3622 (1)

Vendor Pages for CVE-2026-3622 (2)

IV. Related Vulnerabilities

Same product: TL-WR841N v14
Same vendor: TP-Link Systems Inc.
Same weakness: CWE-125

V. Comments for CVE-2026-3622

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