CVE-2026-17251

Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing

HIGH
7.1
CVSS Score
Published: August 21, 2026 at 05:16 PM UTC
Updated: October 14, 2026 at 07:10 PM UTC
1 product affected across 1 vendorTL-MR6400

Using TL-MR6400 v7.0 by TP-Link Systems Inc.?

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Severity
HIGH7.1
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0 ≤ v < 1.9.0 Build 2607140
Affected range stops below 1.9.0 Build 260714, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHTPLink
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-476

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