CVE-2026-8618

A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus due to insufficient validation of decrypted request data length before it is copied into a fixed-size stack buffer in the subtype 0x91 handler. Successful exploitation may allow an adjacent, unauthenticated attacker to cause a denial of service or achieve arbitrary code execution during the device setup phase through crafted TDDP packets.

CVSS 4.0

7.7CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

EPSS

0.3% chance of exploitation in the next 30 days; higher than 17% of CVEs (scores of 2026-10-25)

CWE

CWE-121

Published

2026-10-01

Modified

2026-10-01

Record from

the NVD, synced 2026-10-19

References

• https://www.tp-link.com/en/support/download/deco-m9-plus/v2/#Firmware
• https://www.tp-link.com/us/support/download/deco-m9-plus/v2/#Firmware
• https://www.tp-link.com/us/support/faq/5322/

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