CVE-2019-19825: Totolink a3002ru Firmware

Critical severity, CVSS 9.8. EPSS: 29.6% chance of exploitation in the next 30 days.

On certain TOTOLINK Realtek SDK based routers, the CAPTCHA text can be retrieved via an {"topicurl":"setting/getSanvas"} POST to the boafrm/formLogin URI, leading to a CAPTCHA bypass. (Also, the CAPTCHA text is not needed once the attacker has determined valid credentials. The attacker can perform router actions via HTTP requests with Basic Authentication.) This affects A3002RU through 2.0.0, A702R through 2.1.3, N301RT through 2.1.6, N302R through 3.4.0, N300RT through 3.4.0, N200RE through 4.0.0, N150RT through 3.4.0, and N100RE through 3.4.0.

Affected products

• Totolink a3002ru Firmware: up to and including 2.0.0
• Totolink a702r Firmware: up to and including 2.1.3
• Totolink n100re Firmware: up to and including 3.4.0
• Totolink n150rt Firmware: up to and including 3.4.0
• Totolink n200re Firmware: up to and including 4.0.0
• Totolink n300rt Firmware: up to and including 3.4.0
• Totolink n301rt Firmware: up to and including 2.1.6
• Totolink n302r Firmware: up to and including 3.4.0

Published 2020-01-27. Last modified 2026-06-17.