{"cve":{"cve_id":"CVE-2025-6543","is_kev":true,"kev_date_added":"2025-06-30","kev_vendor_project":"Citrix","kev_product":"NetScaler ADC and Gateway","kev_vulnerability_name":"Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability","kev_short_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.","kev_required_action":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","kev_due_date":"2025-07-21","kev_known_ransomware":false,"kev_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","kev_cwes":["CWE-119"],"epss_score":0.09756,"epss_percentile":0.9491,"epss_as_of":"2026-06-23","description":"Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server","published_at":"2025-06-25T12:49:57.896000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":9.2,"cvss_v4_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L","cvss_v4_severity":"CRITICAL","ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-119"],"nvd_references":["https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:31.350578Z","updated_at":"2026-06-28T23:28:11.665006Z"},"effective_severity":"CRITICAL","badges":["kev"],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"AT","name":"Attack Requirements","value":"P","value_label":"Present"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"L","value_label":"Low"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"L","value_label":"Low"},{"metric":"SA","name":"Availability (Subsequent System)","value":"L","value_label":"Low"}]},"affected":[{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"adc","product_name":"ADC","version_start":"14.1","version_start_inclusive":true,"version_end":"47.46","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:adc:14.1:47.46"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"adc","product_name":"ADC","version_start":"13.1","version_start_inclusive":true,"version_end":"59.19","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:adc:13.1:59.19"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"adc","product_name":"ADC","version_start":"13.1 FIPS and NDcPP","version_start_inclusive":true,"version_end":"37.236","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:adc:13.1 FIPS and NDcPP:37.236"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"gateway","product_name":"Gateway","version_start":"14.1","version_start_inclusive":true,"version_end":"47.46","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:gateway:14.1:47.46"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"gateway","product_name":"Gateway","version_start":"13.1","version_start_inclusive":true,"version_end":"59.19","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:gateway:13.1:59.19"},{"vendor_slug":"netscaler","vendor_name":"NetScaler","product_slug":"gateway","product_name":"Gateway","version_start":"13.1 FIPS and NDcPP","version_start_inclusive":true,"version_end":"37.236","version_end_inclusive":false,"cpe23_uri":"cve5:netscaler:gateway:13.1 FIPS and NDcPP:37.236"}],"exploit_refs":[],"news":[],"references":[{"url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2025-06-25T12:49:57.896000Z","label":"CVE published","source":null},{"type":"cisa_reported","at":"2025-06-30T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"cvss_changed","at":"2026-06-28T17:49:35.290713Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:49:35.290713Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:49:35.290713Z","label":"CVSS score revised","source":"cvelistv5"}]}