CVE-2026-8618: CWE-121 Stack-based buffer overflow in TP-Link Systems Inc. Deco M9 Plus V2
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.
AI Analysis
Technical Summary
This vulnerability (CWE-121) affects the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus V2. The flaw is due to improper length validation of decrypted request data before copying it into a fixed-size stack buffer in the subtype 0x91 handler, leading to a stack-based buffer overflow. Exploitation requires adjacency and no authentication, and can occur during device setup via crafted TDDP packets. The CVSS 4.0 score is 7.7, indicating high severity with attack vector adjacent, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation may allow an adjacent attacker without authentication to cause denial of service or execute arbitrary code on the device during setup. This could compromise device integrity and availability.
Mitigation Recommendations
No patch or official fix information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict adjacency access to the device during setup and monitor for suspicious TDDP packets.
CVE-2026-8618: CWE-121 Stack-based buffer overflow in TP-Link Systems Inc. Deco M9 Plus V2
Description
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 v4.0
Score 7.7high
Affected software
TP-Link Systems Inc.
Deco M9 Plus V2
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-121) affects the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus V2. The flaw is due to improper length validation of decrypted request data before copying it into a fixed-size stack buffer in the subtype 0x91 handler, leading to a stack-based buffer overflow. Exploitation requires adjacency and no authentication, and can occur during device setup via crafted TDDP packets. The CVSS 4.0 score is 7.7, indicating high severity with attack vector adjacent, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation may allow an adjacent attacker without authentication to cause denial of service or execute arbitrary code on the device during setup. This could compromise device integrity and availability.
Mitigation Recommendations
No patch or official fix information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict adjacency access to the device during setup and monitor for suspicious TDDP packets.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- TPLink
- Date Reserved
- 2026-05-14T18:04:17.050Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abea716a43b0b3b89e139d1
Added to database: 10/01/2026, 18:31:50 UTC
Last enriched: 10/01/2026, 18:46:38 UTC
Last updated: 10/02/2026, 03:53:21 UTC
Views: 11
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