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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.

以下是该漏洞描述的中文翻译： TL-WR841N v14 固件中嵌入的 HTTP 服务在处理 请求时存在缓冲区溢出漏洞。由于对攻击者可控的 参数缺乏足够的验证，远程未认证的攻击者可能通过提交构造的请求，覆盖内部缓冲区边界之外的数据，从而导致内存损坏。 成功利用该漏洞可能导致进程内存被修改或损坏，进而引发应用程序的未定义行为。目前尚未证明该漏洞会导致任意代码执行、信息泄露或服务拒绝（DoS）状况。

CVSS 5.3 · Medium
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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

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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