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CVE-2026-76651— Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service 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之前版本存在缓冲区错误漏洞，该漏洞源于嵌入式HTTP服务处理multipart/form-data请求时对攻击者控制的boundary参数验证不足，可能导致远程未认证攻击者提交特制请求破坏内存，

CVSS 5.3 · Medium EPSS 0.44% · P37

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-2026-76651

Vulnerability Information
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Vulnerability Title
Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N
Source: CVE Program / CVE List V5
Vulnerability Description
A buffer overflow vulnerability exists in the embedded HTTP service in TL-WR841N v14 when processing multipart/form-data requests. Insufficient validation of an attacker-controlled boundary parameter may allow a remote unauthenticated attacker to submit a crafted request that corrupts memory by overwriting data beyond the bounds of an internal buffer. Successful exploitation may result in modification or corruption of process memory, potentially leading to undefined application behavior. Arbitrary code execution, information disclosure, and denial-of-service conditions have not been demonstrated.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
TP-Link TL-WR841N 缓冲区错误漏洞
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之前版本存在缓冲区错误漏洞，该漏洞源于嵌入式HTTP服务处理multipart/form-data请求时对攻击者控制的boundary参数验证不足，可能导致远程未认证攻击者提交特制请求破坏内存，
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-2026-76651

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III. Intelligence Information for CVE-2026-76651

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Vendor Advisories for CVE-2026-76651 (1)

Vendor Pages for CVE-2026-76651 (2)

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

CVE-2026-76649 5.3 MEDIUM Pre-Authentication NULL Pointer Dereference in UPnP SOAP Action Request Processing in TP-L
CVE-2026-76650 5.3 MEDIUM Pre-Authentication NULL Pointer Dereference in UPnP SOAP State Variable Query Processing i

IV. Related Vulnerabilities

Same product: TL-WR841N v14
Same vendor: TP-Link System Inc.
Same weakness: CWE-120

V. Comments for CVE-2026-76651

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