What does FIRESTARTER actually do?

FIRESTARTER is a backdoor malware that allows attackers remote access and control over compromised Cisco devices. It's designed to maintain persistence even after security patches are applied and device reboots.

How can I remove FIRESTARTER from my Cisco device?

Cisco strongly recommends reimaging and upgrading the device to fully remove the FIRESTARTER implant. As a temporary mitigation, a cold restart (physically unplugging and replugging the power cord) is advised. Standard reboot commands will not clear the malware.

Is FIRESTARTER linked to a specific country?

While analysis suggests links to China-nexus threat actors, the agencies have not definitively attributed the specific campaign to a single entity. The broader campaign, UAT4356, is associated with advanced persistent threat ( APT ) activity.

🕳️ Vulnerabilities & CVEs

FIRESTARTER Malware Survives Cisco Patches [Analysis]

Cisco devices are under siege from FIRESTARTER, a stealthy backdoor that clings to compromised systems even after security patches are applied. This isn't just a glitch; it's a fundamental challenge to patch management.

Threat Digest Apr 25, 2026 4 min read

Diagram showing a network device with a red warning symbol and a small ghost-like figure representing malware.

⚡ Key Takeaways

FIRESTARTER backdoor malware can persist on Cisco devices even after security patches are applied. 𝕏
The malware exploits vulnerabilities (CVE-2025-20333, CVE-2025-20362) and uses a bootkit mechanism for resilience. 𝕏
A full reimaging of the device or a hard power cycle is recommended for removal, as standard reboots are insufficient. 𝕏

Written by

Maya Thompson

Threat intelligence reporter. Tracks CVEs, ransomware groups, and major breach investigations.

#APT #CISA #backdoor malware #cisco firepower #firestarter #ncsc

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Originally reported by The Hacker News

⚡ Key Takeaways

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Maya Thompson

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