Citrix has released a critical security bulletin addressing a vulnerability affecting NetScaler ADC (formerly Citrix ADC) and NetScaler Gateway (formerly Citrix Gateway). Citrix NetScaler is an all-in-one load balancer, web application firewall (WAF), virtual private network (VPN) gateway and SSL offloading tool for web applications.
- CVE-2025-6543 is a ‘memory overflow’ vulnerability with a CVSSv4 base score of 9.2. Successful exploitation could allow a remote unauthenticated attacker to gain unintended control flow and perform denial-of-service (DoS) in NetScaler ADC and NetScaler Gateway. NetScaler is only vulnerable to CVE-2025-6543 when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.
Read more…
Source: NHS Digital
Sign up for our Newsletter
The latest news and insights delivered right to your inbox.
Related:
- ‘iLeakage’ Attack Can Force Apple Safari To Reveal Passwords
October 26, 2023
A group of academic researchers has developed a speculative execution attack named “iLeakage” that can extract sensitive data, such as passwords and emails, on recent Apple devices via the Safari web browser. iLeakage has been developed by a team of academics from Georgia Tech, the University of Michigan, and Ruhr University Bochum after extensive examination of ...
- The outstanding stealth of Operation Triangulation
October 23, 2023
In the previous blogpost on Triangulation, Kaspersky researchers discussed the details of TriangleDB, the main implant used in this campaign, its C2 protocol and the commands it can receive. The researchers mentioned, among other things, that it is able to execute additional modules. They also mentioned that this operation was quite stealthy. This article details ...
- Ransomware actor exploits unsupported ColdFusion servers – but comes away empty-handed
October 19, 2023
Servers are always a point of interest for threat actors as they are one of the most efficient attack vectors to penetrate an organization. Server-related accounts often have the highest privilege levels, making lateral movement to other machines in the network easily achievable. Sophos X-Ops has observed a wide variety of threats being delivered to ...
- Multiple North Korean threat actors exploiting the TeamCity CVE-2023-42793 vulnerability
October 18, 2023
Since early October 2023, Microsoft has observed two North Korean nation-state threat actors – Diamond Sleet and Onyx Sleet – exploiting CVE-2023-42793, a remote-code execution vulnerability affecting multiple versions of JetBrains TeamCity server. TeamCity is a continuous integration/continuous deployment (CI/CD) application used by organizations for DevOps and other software development activities. In past operations, Diamond ...
- Government-backed actors exploiting WinRAR vulnerability
October 18, 2023
In recent weeks, Google’s Threat Analysis Group’s (TAG) has observed multiple government-backed hacking groups exploiting the known vulnerability, CVE-2023-38831, in WinRAR, which is a popular file archiver tool for Windows. Cybercrime groups began exploiting the vulnerability in early 2023, when the bug was still unknown to defenders. A patch is now available, but many users still ...
- Updated MATA attacks industrial companies in Eastern Europe
October 18, 2023
In early September 2022, Kaspersky researchers discovered several new malware samples belonging to the MATA cluster. As they were collecting and analyzing the relevant telemetry data, they realized the campaign had been launched in mid-August 2022 and targeted over a dozen corporations in Eastern Europe from the oil and gas sector and defense industry. The actors ...