CVE-2026-17251

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 4.0

7.1CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-25)

CWE

CWE-476

Published

2026-08-21

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

References

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

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