Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing (CVE-2026-17251) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-17251

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

Answer in brief

CVE-2026-17251 records a Unknown severity vulnerability in Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing. The current sources do not mark it as known exploited. The current feed maps TP-Link Systems Inc./TL-MR6400 v7.0 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 21, 2026Updated Aug 21, 2026Source checked Aug 21, 2026First seen by HOL Aug 21, 2026Material review Aug 21, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TP-Link Systems Inc./TL-MR6400 v7.0 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TP-Link Systems Inc./TL-MR6400 v7.0generic	>=0 <1.9.0 Build 260714	1.9.0 Build 260714

Recommended response

Check inventory. Check lockfiles and deployed manifests for TP-Link Systems Inc./TL-MR6400 v7.0.
Review the reported fix. Update TP-Link Systems Inc./TL-MR6400 v7.0 to 1.9.0 Build 260714 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 21, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.