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:
- The fourth horseman: CVE-2019-0797 vulnerability
March 13, 2019
The new zero-day in the Windows OS exploited in targeted attacks In February 2019, our Automatic Exploit Prevention (AEP) systems detected an attempt to exploit a vulnerability in the Microsoft Windows operating system. Further analysis of this event led to us discovering a zero-day vulnerability in win32k.sys. We reported it to Microsoft on February 22, 2019. ...
- Yatron Ransomware Plans to Spread Using EternalBlue NSA Exploits
March 12, 2019
A new Ransomware-as-a-Service called Yatron is being promoted on Twitter that plans on using the EternalBlue and DoublePulsar exploits to spread to other computer on a network. This ransomware will also attempt to delete encrypted files if a payment has not been made in 72 hours. BleepingComputer was first notified about the Yatron RaaS by a security ...
- New SLUB Backdoor Uses GitHub, Communicates via Slack
March 7, 2019
We recently came across a previously unknown malware that piqued our interest in multiple ways. For starters, we discovered it being spread via watering hole attacks, a technique that involves an attacker compromising a website before adding code to it so visitors are redirected to the infecting code. In this case, each visitor is redirected only ...
- Google reveals Chrome zero-day under active attacks
March 6, 2019
Google revealed yesterday that a patch for Chrome last week was actually a fix for a zero-day that was under active attacks. The attacks exploited CVE-2019-5786, a security flaw and the only patch included in the Chrome 72.0.3626.121 version, released last Friday, March 1, 2019. According to an update to its original announcement and a tweet from Google Chrome’s security lead, ...
- Hide yo’ kids, hide yo’ clouds: Zerodium offering big bucks for cloud zero-days
March 5, 2019
Exploit vendor Zerodium announced today plans to pay a whopping $500,000 for zero-days in popular cloud technologies like Microsoft’s Hyper-V and (Dell) VMware’s vSphere. Both Hyper-V and vSphere are what experts call virtualization software, also called hypervisors –software that lets a single “host” server create and run one or more virtual “guest” operating systems. Virtualization software is ...
- New exploit lets attackers take control of Windows IoT Core devices
March 2, 2019
Speaking at a conference today, a security researcher has revealed a new exploit impacting the Windows IoT Core operating system that gives threat actors full control over vulnerable devices. The vulnerability, discovered by Dor Azouri, a security researcher for SafeBreach, impacts the Sirep/WPCon communications protocol included with Windows IoT operating system. Azouri said the vulnerability only impacts Windows ...