CVE-2021-42659: Tenda AC9 Firmware

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

There is a buffer overflow vulnerability in the Web server httpd of the router in Tenda router devices such as Tenda AC9 V1.0 V15.03.02.19(6318) and Tenda AC9 V3.0 V15.03.06.42_multi. When setting the virtual service, the httpd program will crash and exit when the super-long list parameter occurs.

Affected products

• Tenda AC9 Firmware: version 15.03.05.19(6318) only; version 15.03.06.42_multi only

Published 2022-05-24. Last modified 2026-06-17.