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Wire · technology

CISA: WatchGuard Firebox bug exploited in ransomware campaigns

10 September 2026 · By · Wire by Fusion42

Published

10 September 2026

Topic

technology

◆ Sectors

Cybersecurity

◆ Geography

United States

◆ Source

Read at scworld.com →

◆ Verified

Fusion42 · 10 September 2026 · Fusion42 review

CISA confirmed that a critical out-of-bounds write vulnerability in WatchGuard Firebox, added to its Known Exploited Vulnerabilities catalog in December 2025, is now actively exploited in ransomware campaigns, urging immediate patching and credential rotation.

This Wire brief sits within Fusion42's coverage of Cybersecurity.

◆ ◆ The Wire takeaway

You face active ransomware attacks exploiting WatchGuard Firebox flaws now. Patch immediately and rotate credentials to avoid breaches; this is an urgent threat to your firewall’s boundary defence.

◆ Coverage

1 source · 10 Sep 2026

◆ Related on Wire

◆ Topics

Cybersecuritywatchguardfirewall-bugcisaransomwarepatch-now