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:
- CISA Adds Two Known Exploited Vulnerabilities to Catalog
May 16, 2022
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation. These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risk to the federal enterprise. Note: to view the newly added vulnerabilities in the catalog, click on the arrow on the ...
- Apache Releases Security Advisory for Tomcat
May 16, 2022
The Apache Software Foundation has released a security advisory to address a vulnerability in multiple versions of Tomcat. An attacker could exploit this vulnerability to obtain sensitive information. CISA encourages users and administrators to review Apache’s security advisory and apply the necessary updates. Read more… Source: U.S. Cybersecurity and Infrastructure Security Agency
- Apple emergency update fixes zero-day used to hack Macs, Watches
May 16, 2022
Apple has released security updates to address a zero-day vulnerability that threat actors can exploit in attacks targeting Macs and Apple Watch devices. Zero-days are security flaws that the software vendor is unaware of and hasn’t yet patched. In some cases, this type of vulnerability may also have publicly available proof-of-concept exploits before a patch arrives ...
- Microsoft closes Windows LSA hole under active attack
May 11, 2022
Microsoft patched 74 security flaws in its May Patch Tuesday batch of updates. That’s seven critical bugs, 66 deemed important, and one ranked low severity. At least one of the vulnerabilities disclosed is under active attack with public exploit code, according to Redmond, while two others are listed as having public exploit code. After April’s astonishing 100-plus ...
- Exploits created for critical F5 BIG-IP flaw – install patch immediately
May 8, 2022
Security researchers are warning F5 BIG-IP admins to immediately install the latest security updates after creating exploits for a recently disclosed critical CVE-2022-1388 remote code execution vulnerability. Last week, F5 disclosed a new critical remote code execution in BIG-IP networking devices tracked as CVE-2022-1388. This vulnerability affects the BIG-IP iControl REST authentication component and allows remote ...
- VM escape and root access bugs fixed in Cisco NFV infrastructure software
May 5, 2022
Cisco has released patches for a trio of bugs that hit its Enterprise NFV Infrastructure Software, and could result in escaping from virtual machines, running commands as root, and leaking system data. Leading the way with a CVSS score of 9.9 is CVE-2022-20777 and relates to a bug in next generation input/output feature that allowed an ...