CVE-2026-17251— Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing
Quick assessment
Affected
TP-Link Systems Inc. TL-MR6400 v7.0
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.
TL-MR6400 v7 的 HTTP 请求解析功能中存在空指针解引用漏洞。未经身份验证的远程攻击者可通过发送包含格式错误的会话 Cookie 头的特制 HTTP 请求来触发该漏洞。 成功利用该漏洞可能导致 HTTP 服务进程崩溃，从而引发拒绝服务（DoS）状况，并在服务恢复前暂时失去管理和 CGI 功能。
Possible ATT&CK Techniques 2 AI
T1499 · Endpoint Denial of Service T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| TP-Link Systems Inc. | TL-MR6400 v7.0 | < 1.9.0 Build 260714 |
affected |
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I. Basic Information for CVE-2026-17251
Vulnerability Information
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Vulnerability Title
Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL
pointer dereference vulnerability exists in the HTTP request parsing
functionality of
TL-MR6400 v7. An unauthenticated remote attacker can
trigger the vulnerability by sending a specially crafted HTTP request
containing a malformed session cookie header.
Successful
exploitation may cause the HTTP service process to crash, resulting in a
denial-of-service condition and temporary loss of management or CGI
functionality until service recovery.
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
空指针解引用
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| TP-Link Systems Inc. | TL-MR6400 v7.0 | 0 ~ 1.9.0 Build 260714 | - |
|
II. Public POCs for CVE-2026-17251
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-17251 (1)
Vendor Pages for CVE-2026-17251 (1)
Same Patch Batch · TP-Link Systems Inc. · 2026-08-21 · 3 CVEs total
| CVE-2026-17250 | 8.5 HIGH | Authenticated Remote Code Execution via Stack-Based Buffer Overflow in Firmware Update Han |
| CVE-2026-17252 | 7.1 HIGH | Unauthenticated Denial of Service via Composed HTTP Parsing and Stack-Based Out-of-Bounds |
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V. Comments for CVE-2026-17251
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