Entries by Joseph Lee

January 2026 Threat Report: Off to a Raucous Start

So far, 2026 is off to a raucous start. The number of critical severity vulnerabilities impacting widely deployed software is staggering. Defenders need to scan widely and scan often to detect new threats in their infrastructure and prioritize mitigation efforts based on the potential impact to business operations, privacy regulations, and other compliance responsibilities. Defenders […]

CVE-2025-64155: In the Wild Exploitation of FortiSIEM for Unauthenticated Root-Level RCE

On January 13th, 2026, Fortinet publicly disclosed and patched CVE-2025-64155 (CVSS 9.8) affecting FortiSIEM along with five additional vulnerabilities across its product line [1][2][3][4][5]. In particular, CVE-2025-64155 represents high-risk exposure; immediately after its release, active exploitation was reported. The flaw was responsibly disclosed to Fortinet almost six months ago (August 2025), by Horizon3.ai. Greenbone includes […]

December 2025 Threat Report: Emergency End-of-Year Patches and New Exploit Campaigns

In 2025, Greenbone increased the total number of vulnerability tests in the OPENVAS ENTERPRISE FEED to over 227,000, adding almost 40,000 vulnerability checks. Since the first CVE was published in 1999, over 300,000 software vulnerabilities have been added to MITRE’s CVE repository. CVE disclosures continued to rocket upward, increasing roughly 21% compared to 2024. CISA […]

New Actively Exploited CVSS 10 Flaw in Cisco AsyncOS Spam Quarantine Remote Access

! Update January 26, 2026 On January 15th, 2025, Cisco released patches for CVE-2025-20393 CVSS 10. Cisco recommends upgrading to a fixed release. The patches are intended to remove the persistence mechanisms observed in the campaign. There are no workarounds; patching is required for complete mitigation. Fixed versions are: • Cisco Secure Email Gateway (SEG) […]

React2Shell: A Critical React and Next.js Flaw Is Actively Exploited

! Update December 15, 2025 Three additional React Server Components (RSC) flaws have been identified, which require further patching: • CVE-2025-55184 CVSS 7.5 and CVE-2025-67779 CVSS 7.5: Both flaws allow pre-authenticated Denial of Service (DoS). CVE-2025-67779 is considered a bypass of the original React2Shell patch. However, exploitation does not allow remote code execution (RCE). • […]

November 2025 Threat Report: Data Theft Leads a Volatile Ransomware Landscape

Was November 2025 a quiet month for cyber security? No, of course not. Fallout from the Oracle EBS ransomware campaigns, which began in October, was widespread; over 29 organizations have been claimed by the Cl0p syndicate alone, with over 100 victims in total. This included Envoy Air (an American Airlines subsidiary), Cox Enterprises, Logitech, Harvard […]

October 2025 Threat Report

Just over 4,100 new CVEs emerged in October 2025, representing new attack surfaces and placing pressure on defenders to identify and patch. For operational resilience, organizations need to scan their IT infrastructure often and prioritize mitigation efforts. A free trial of Greenbone’s OPENVAS BASIC lets defenders scan their enterprise IT estate and stay on top […]

CVE-2025-64446: A Lurking FortiWeb Vulnerability Proves Critical amid Active Exploitation

Discussion of a new security issue affecting Fortinet’s FortiWeb began circulating online in early October 2025, when cyber deception firm Defused reported capturing a working exploit via honeypot. FortiWeb is Fortinet’s web application firewall (WAF) platform, designed to shield web applications from malicious activity. For over one month, Defused’s revelation mostly lurked in the shadows; […]

September 2025 Threat Report: New Exploits, Active Campaigns, and Critical CVEs

In total, just over 4,500 CVEs were published in September, exposing defenders to new risk. For operational resilience, organizations need to scan their IT infrastructure to identify where hidden risk could impact their operations. A free trial of Greenbone’s OPENVAS BASIC allows defenders to scan their enterprise IT infrastructure to stay on top of emerging […]

ArcaneDoor Espionage Campaign Exploiting High-Risk Cisco ASA and FTD Firewall Flaws

On September 25, 2025, three new CVEs affecting Cisco networking products exploded onto the global cyber security landscape. Two of these were actively exploited as zero-days prior to their disclosure. Greenbone now includes detection tests for all three new high-risk CVEs in the OPENVAS ENTERPRISE FEED. CVE-2025-20333 (CVSS 9.9) and CVE-2025-20362 (CVSS 6.5) affect the […]