{"id":"CVE-2026-8452","aliases":["EUVD-2026-40307","GHSA-r7wg-r5wj-c765"],"status":"published","title":"Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service","description":"Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server","severity":{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01011,"percentile":0.63639,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-119"],"published":"2026-06-30T12:41:07Z","modified":"2026-08-27T04:18:00Z","kev":{"date_added":"2026-08-26","due_date":"2026-08-29","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2026-08-26"},{"source":"kev","since":"2026-08-26"}],"exploits":[{"source":"pocgithub","id":"securekomodo/citrixInspector","title":"securekomodo/citrixInspector","date":"2023-07-20","url":"https://github.com/securekomodo/citrixInspector"},{"source":"pocgithub","id":"watchtowrlabs/watchTowr-vs-Citrix-Netscaler-PreAuth-RCE-CVE-2026-8452","title":"watchtowrlabs/watchTowr-vs-Citrix-Netscaler-PreAuth-RCE-CVE-2026-8452","date":"2026-08-14","url":"https://github.com/watchtowrlabs/watchTowr-vs-Citrix-Netscaler-PreAuth-RCE-CVE-2026-8452"},{"source":"pocgithub","id":"BishopFox/CVE-2026-8452-check","title":"BishopFox/CVE-2026-8452-check","date":"2026-08-20","url":"https://github.com/BishopFox/CVE-2026-8452-check"},{"source":"pocgithub","id":"maxprog-svg/CitrixBleedCVE-2026-8452-2025-5777","title":"maxprog-svg/CitrixBleedCVE-2026-8452-2025-5777","date":"2026-08-30","url":"https://github.com/maxprog-svg/CitrixBleedCVE-2026-8452-2025-5777"},{"source":"pocgithub","id":"techupdate24/citrix-netscaler-cve-2026-8452-rce","title":"techupdate24/citrix-netscaler-cve-2026-8452-rce","date":"2026-09-27","url":"https://github.com/techupdate24/citrix-netscaler-cve-2026-8452-rce"}],"products":[{"vendor":"citrix","product":"netscaler adc and netscaler gateway"},{"vendor":"citrix","product":"netscaler_application_delivery_controller"},{"vendor":"citrix","product":"netscaler_gateway"},{"vendor":"netscaler","product":"adc"},{"vendor":"netscaler","product":"gateway"}],"references":[{"url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-8452","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8452"},{"url":"https://github.com/advisories/GHSA-r7wg-r5wj-c765"}],"sources":{"cve":[{"id":"CVE-2026-8452","title":"Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of Service","description":"Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server","status":"published","published":"2026-06-30T12:41:07.622Z","modified":"2026-08-27T03:56:34.886Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L","level":"high","assessor":"cna"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T13:48:13.398044Z"}],"euvd":[{"id":"EUVD-2026-40307","description":"Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server","status":"published","published":"2026-06-30T12:41:07Z","modified":"2026-08-27T03:56:34Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L","level":"high"}],"exploited_since":"2026-08-26","updated_at":"2026-11-02T18:01:28.934147Z"}],"ghsa":[{"id":"GHSA-r7wg-r5wj-c765","title":"Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or...","description":"Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server","status":"published","published":"2026-06-30T15:30:46Z","modified":"2026-08-26T18:30:34Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T15:10:59.276943Z"}],"kev":[{"id":"CVE-2026-8452","title":"Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability","description":"Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability which could lead to denial of service. ","cwes":["CWE-119"],"kev":{"date_added":"2026-08-26","due_date":"2026-08-29","required_action":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2026-8452","description":"Memory overflow vulnerability NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server","status":"published","published":"2026-06-30T13:19:33.45Z","modified":"2026-08-27T04:18:00.787Z","cvss":[{"version":"4.0","score":8.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:12:26.508751Z"}]}}