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An urgent zero-day remote code execution (RCE) vulnerability, identified as CVE-2025-7775, is impacting more than 28,000 Citrix instances globally.
This vulnerability is currently being exploited in real-world scenarios, leading the U.S. Cybersecurity and Infrastructure Security Agency (CISA) to include it in its Known Exploited Vulnerabilities (KEV) catalog.
The Shadowserver Foundation revealed that as of August 26, 2025, over 28,200 servers remain unpatched, with the most significant number of susceptible systems found in the United States and Germany.
Citrix has issued patches and urges system administrators to implement them immediately to avert system exploitation. The ongoing exploitation of this vulnerability presents a considerable risk, as it enables unauthorized attackers to execute arbitrary code on the compromised servers, potentially leading to complete system takeover, data theft, and further network breaches.
CVE-2025-7775: A Significant RCE Vulnerability
Remote code execution vulnerabilities rank among the most dangerous security flaws, and CVE-2025-7775 is no different. It permits a remote attacker, without any credentials, to execute harmful code on a vulnerable Citrix server.
| Vulnerability Information | Details |
|---|---|
| CVE Identifier | CVE-2025-7775 |
| Type of Vulnerability | Unauthenticated Remote Code Execution (RCE) |
| Status | Actively Exploited in the Real World (CISA KEV) |
| Instances Affected | More than 28,200 (as of Aug 26, 2025) |
| Key Mitigation | Implement patches from Citrix Security Bulletin CTX694938 |
| Most Affected Nations | United States, Germany |
This level of access might allow threat actors to deploy ransomware, establish backdoors for ongoing access, exfiltrate sensitive corporate information, or utilize the breached server as a launching point for attacks on other systems within the network.
The “zero-day” label signifies that attackers were exploiting the flaw prior to the release of an official patch by Citrix. This provided threat actors a crucial opportunity to compromise exposed systems.
Considering the extensive use of Citrix products for secure remote access and application delivery in corporate settings, the potential ramifications of this vulnerability are considerable. A successful exploit could disrupt business functions and incur significant financial and reputational harm.
The confirmation of exploitation in real-world scenarios by CISA emphasizes the necessity for prompt action. By including CVE-2025-7775 in the KEV catalog, CISA has mandated that U.S. Federal Civilian Executive Branch (FCEB) agencies apply patches to their systems by a designated deadline, a directive that all organizations are advised to adhere to.
The widespread nature of this vulnerability, impacting tens of thousands of servers internationally, indicates that automated attacks are likely to increase as more attackers seek to exploit the flaw.
Citrix has released a safety bulletin, CTX694938, which contains the necessary patch details and instructions. The primary and most effective approach to mitigation is to implement the updates to all affected instances without delay.
For organizations unable to patch immediately, it is essential to scrutinize server logs for any signs of compromise (IoCs), such as unusual processes or outbound network activities.
Segregating vulnerable servers from the internet and implementing web application firewall (WAF) rules to obstruct exploit attempts can act as temporary compensating measures.
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