High 7.1Published Aug 21, 2026

CVE-2026-17251Unauthenticated Denial of Service via Null Pointer Dereference in HTTP Request Parsing

Updated under an hour ago (2026-10-19 09:20 UTC)

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It affects TP-Link Systems Inc. TL-MR6400 v7.0. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for TP-Link Systems Inc. TL-MR6400 v7.0

Exploited in the last 30 days

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.

CVSS: 7.1 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: TPLink
NVD analysis: Awaiting Analysis
Record last updated: Aug 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

TP-Link Systems Inc. TL-MR6400 v7.0 tp_link_systems:tl_mr6400_v7.0 (from the name)	before 1.9.0 Build 260714	CNA record

References

https://www.tp-link.com/en/support/download/tl-mr6400/v7/#Firmwarepatch
https://www.tp-link.com/tw/support/download/tl-mr6400/v7/#Firmwarepatch
https://www.tp-link.com/us/support/faq/5259/vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.