{"cveID":"CVE-2025-6543","vendorProject":"Citrix","product":"NetScaler ADC and Gateway","vulnerabilityName":"Citrix NetScaler ADC and Gateway Buffer Overflow Vulnerability","dateAdded":"2025-06-30","shortDescription":"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.","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.","dueDate":"2025-07-21","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","cwes":["CWE-119"],"year":2025,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2025-6543","technique":"T1203","technique_name_at_mapping":"Exploitation for Client Execution","mapping_type":"exploitation_technique","capability_group":"buffer_overflow","comments":"An unprivileged attacker can leverage this buffer overflow vulnerability, leading to a denial of service attack. No public exploits of this vulnerability exist, and information from Citrix is limited.","references":["https://www.rapid7.com/blog/post/etr-zero-day-exploitation-of-netscaler-adc-and-netscaler-gateway/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2025-6543","technique":"T1059","technique_name_at_mapping":"Command and Scripting Interpreter","mapping_type":"secondary_impact","capability_group":"buffer_overflow","comments":"An unprivileged attacker can leverage this buffer overflow vulnerability, leading to a denial of service attack, and potentially remote code execution. No public exploits of this vulnerability exist, and information from Citrix is limited.","references":["https://www.rapid7.com/blog/post/etr-zero-day-exploitation-of-netscaler-adc-and-netscaler-gateway/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2025-6543","technique":"T1498","technique_name_at_mapping":"Network Denial of Service","mapping_type":"primary_impact","capability_group":"buffer_overflow","comments":"An unprivileged attacker can leverage this buffer overflow vulnerability, leading to a denial of service attack, and potentially remote code execution. No public exploits of this vulnerability exist, and information from Citrix is limited.","references":["https://www.rapid7.com/blog/post/etr-zero-day-exploitation-of-netscaler-adc-and-netscaler-gateway/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1059","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Command and Scripting Interpreter","name_at_mapping":"Command and Scripting Interpreter","renamed":false,"revoked_by":null,"mapping_types":["secondary_impact"],"sigma_rule_count":95,"has_detection_strategy":true},{"id":"T1203","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Exploitation for Client Execution","name_at_mapping":"Exploitation for Client Execution","renamed":false,"revoked_by":null,"mapping_types":["exploitation_technique"],"sigma_rule_count":35,"has_detection_strategy":true},{"id":"T1498","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Network Denial of Service","name_at_mapping":"Network Denial of Service","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":3,"has_detection_strategy":true}],"mapping_types":["exploitation_technique","primary_impact","secondary_impact"],"has_exploitation_technique":true,"mapping_attack_versions":["16.1"],"mapping_domains":["enterprise"],"sigma_coverage":"full","sigma_rules_tagged_cve":[],"added_after_mapping_snapshot":false,"_source":"kevmap","_built":"2026-08-23 05:47 UTC","_attack_version":"19.2"}