Critical Citrix Patch: Actively Exploited CVE-2025-6543 in NetScaler ADC

TL;DR

Citrix has released emergency patches to address a critical vulnerability (CVE-2025-6543) in NetScaler ADC, actively exploited in the wild. The flaw, with a CVSS score of 9.2, can lead to unintended control flow and denial-of-service.

• CVE ID: CVE-2025-6543
• CVSS Score: 9.2
• Impact: Memory overflow leading to potential control flow manipulation and denial-of-service
• Mitigation: Apply the latest Citrix security updates immediately

Critical Vulnerability in Citrix NetScaler ADC

Citrix has released security updates to address a critical flaw affecting NetScaler ADC that has been actively exploited in the wild. The vulnerability, tracked as CVE-2025-6543, carries a CVSS score of 9.2 out of a maximum of 10.0. This issue is described as a memory overflow that could result in unintended control flow and denial-of-service.

Impact and Severity

Successful exploitation of this vulnerability can lead to serious consequences, including:

• Unintended Control Flow: Attackers can manipulate the control flow of the affected system, leading to unauthorized actions.
• Denial-of-Service (DoS): The vulnerability can cause the system to become unresponsive, disrupting critical services.

Mitigation Steps

Citrix urges all users to apply the latest security updates immediately to protect against potential exploits. The updates are available on the Citrix official website.

For more details, visit the full article: source

Conclusion

The discovery and active exploitation of CVE-2025-6543 underscore the importance of timely security updates. Organizations using Citrix NetScaler ADC should prioritize applying the latest patches to mitigate the risks associated with this critical vulnerability. Staying vigilant and proactive in cybersecurity measures is essential to protect against evolving threats.

Additional Resources

For further insights, check:

• Citrix Security Bulletin
• National Vulnerability Database (NVD)