Vulnerability Bulletins

Reports about Cyber Actors Hiding in Router Firmware

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Affected software Cisco


On September 27, 2023, a joint cybersecurity advisory (CSA) was released detailing activities of the cyber actors known as BlackTech. The CSA describes how BlackTech is able to modify router firmware without detection. For a description of this report, see Peoples Republic of China-Linked Cyber Actors Hide in Router Firmware. Cisco has reviewed the report. Cisco would like to highlight the following key facts: The most prevalent initial access vector in these attacks involves stolen or weak

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Ministerio de Defensa