{"cvss":0.0,"datePublished":"2025-06-30","dateUpdated":"2025-06-30","description":"Citrix NetScaler ADC and Gateway contain a buffer overflow vulnerability leading to unintended control flow and Denial of Service. NetScaler must be configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.","dueDate":"2025-07-21","id":"CVE-2025-6543","kev_catalogs":["cisa"],"knownRansomwareCampaignUse":"Unknown","notes":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788 ; https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/ ;   https://nvd.nist.gov/vuln/detail/CVE-2025-6543","product":"NetScaler ADC and Gateway","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","severity":"HIGH","source":"cisa_known_exploited","title":"Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability","vendor":"Citrix"}