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Attacker Exploited Citrix Zero-Day Three Days Before the CVE Existed
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For Government
For Enterprise
Products
Enterprise and Government
GreyNoise Platform
Real-time, verifiable network threat intelligence
Small and Mid-Sized Businesses
GreyNoise Block
Fully configurable, real-time blocklists to stop attackers in their tracks
Plans
Integrations
Resources
Blog
Resource Library
Tag Request
Documentation
Company
About
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In the News
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The latest news, announcements, and perspectives from GreyNoise.
Kiteworks & Citrix Incidents Show Challenges of Zero-Day Response
Oct 2, 2026
Citrix NetScaler Zero-Day: Patch Now, Then Check If Hackers Were Already Inside
Sep 30, 2026
Citrix NetScaler Zero-Day Attacks Deploy Custom Malware Against Banks and Governments
Sep 30, 2026
Attackers Exploit NetScaler Flaw for Root Access, Deploy WHIPSHOT and SLAPSHOT
Sep 30, 2026
Dual NetScaler Zero-Days Trigger Chaos for Citrix Customers
Sep 29, 2026
Custom malware used in Citrix 0-day attacks targeting govt, banks, professional services
Sep 29, 2026
Citrix NetScaler exploitation began days before public notification
Sep 29, 2026
NetScaler zero-day exploitation escalates into mass attacks (CVE-2026-88771)
Sep 29, 2026
AI Agent Swarm Mass-Exploited 440 PaperCut Instances in 48 Countries-and Ignored Its Operators’ Exclusion List
Sep 28, 2026
CISA Says Attackers Are Exploiting Two Critical Citrix NetScaler Flaws Globally
Sep 28, 2026
Citrix patches actively exploited NetScaler zero-days after a weekend of unofficial warnings
Sep 28, 2026
Mark Mager Joins GreyNoise as Head of Adversary Engagement
Sep 28, 2026
Andrew Thompson Named GreyNoise Adversary Operations SVP
Sep 28, 2026
Joe Lampert Joins GreyNoise as National Security Solutions Director
Sep 25, 2026
Steve Miller Named GreyNoise Principal Threat Researcher
Sep 24, 2026
Chinese Hackers Hit 49 Orgs, 996 Zyxel Devices [2026]
Sep 22, 2026
WordPress “wp2shell” attacks stole 18,000 government records
Sep 22, 2026
Chinese hackers exploit WordPress, Zyxel flaws to steal govt data
Sep 22, 2026
Attacker compromised nearly 1000 Zyxel switches since August (CVE-2026-7273)
Sep 22, 2026
Hackers Breach Government WordPress Site and Steal 18,566 Records With Plaintext Passwords
Sep 22, 2026
Zyxel and Veeam Flaws Under Active Exploitation With Command and SYSTEM Access
Sep 22, 2026
Hackers Exploit WordPress Flaws to Steal 18,566 Government Records and Plaintext Passwords
Sep 22, 2026
Recent ZyXEL Switch Vulnerability Exploited by Chinese Hackers
Sep 22, 2026
China-nexus actor steals thousands of documents in monthslong exploitation campaign
Sep 21, 2026
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