{"cve":{"cve_id":"CVE-2026-88772","is_kev":true,"kev_date_added":"2026-09-27","kev_vendor_project":"Citrix","kev_product":"NetScaler","kev_vulnerability_name":"Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability","kev_short_description":"Citrix NetScaler ADC and NetScaler Gateway contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for remote code execution or denial of service","kev_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.","kev_due_date":"2026-09-30","kev_known_ransomware":false,"kev_notes":"Running the provided IOCs in the NetScaler console may help identify indicators of exploitation. Customers must conduct forensic triage as directed by BOD 26‑04 and follow Citrix’s published guidance for mitigations. For more information, please see: https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778 ; https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 ; https://support.citrix.com/external/article/CTX694799/steps-to-take-if-netscaler-adc-is-suspec.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-88772","kev_cwes":["CWE-119"],"epss_score":0.01301,"epss_percentile":0.69936,"epss_as_of":"2026-10-15","description":"Vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway.\n\nThis issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to Remote Code Execution or Denial of Service","published_at":"2026-09-27T16:09:56.033000Z","last_modified_at":"2026-09-28T12:26:47.670000Z","cvss_v3_score":8.1,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":9.5,"cvss_v4_vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","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=CTX697096&articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778"],"vuln_status":"Analyzed","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":"2026-09-27T16:38:54.190028Z","updated_at":"2026-10-02T10:03:01.593453Z"},"effective_severity":"CRITICAL","badges":["kev","news"],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"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":"N","value_label":"None"},{"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":"H","value_label":"High"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"H","value_label":"High"},{"metric":"SA","name":"Availability (Subsequent System)","value":"H","value_label":"High"}]},"affected":[{"vendor_slug":"citrix","vendor_name":"Citrix","product_slug":"netscaler-application-delivery-controller","product_name":"netscaler_application_delivery_controller","version_start":"13.1","version_start_inclusive":true,"version_end":"13.1.37.279","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*"},{"vendor_slug":"citrix","vendor_name":"Citrix","product_slug":"netscaler-application-delivery-controller","product_name":"netscaler_application_delivery_controller","version_start":"13.1","version_start_inclusive":true,"version_end":"13.1-64.23","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*"},{"vendor_slug":"citrix","vendor_name":"Citrix","product_slug":"netscaler-application-delivery-controller","product_name":"netscaler_application_delivery_controller","version_start":"13.1","version_start_inclusive":true,"version_end":"13.1.37.279","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*"},{"vendor_slug":"citrix","vendor_name":"Citrix","product_slug":"netscaler-gateway","product_name":"NetScaler Gateway","version_start":"13.1","version_start_inclusive":true,"version_end":"13.1-64.23","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*"},{"vendor_slug":"citrix-netscaler","vendor_name":"Citrix NetScaler","product_slug":"adc","product_name":"ADC","version_start":"0","version_start_inclusive":true,"version_end":"14.1-73.37","version_end_inclusive":false,"cpe23_uri":"cve5:citrix-netscaler:adc:0:14.1-73.37"},{"vendor_slug":"citrix-netscaler","vendor_name":"Citrix NetScaler","product_slug":"adc","product_name":"ADC","version_start":"0","version_start_inclusive":true,"version_end":"13.1-64.23","version_end_inclusive":false,"cpe23_uri":"cve5:citrix-netscaler:adc:0:13.1-64.23"},{"vendor_slug":"citrix-netscaler","vendor_name":"Citrix NetScaler","product_slug":"adc","product_name":"ADC","version_start":"0","version_start_inclusive":true,"version_end":"14.1-73.37 FIPS","version_end_inclusive":false,"cpe23_uri":"cve5:citrix-netscaler:adc:0:14.1-73.37 FIPS"},{"vendor_slug":"citrix-netscaler","vendor_name":"Citrix NetScaler","product_slug":"adc","product_name":"ADC","version_start":"0","version_start_inclusive":true,"version_end":"13.1.37.279 FIPS and NDcPP","version_end_inclusive":false,"cpe23_uri":"cve5:citrix-netscaler:adc:0:13.1.37.279 FIPS and NDcPP"},{"vendor_slug":"citrix-netscaler","vendor_name":"Citrix NetScaler","product_slug":"gateway","product_name":"Gateway","version_start":"0","version_start_inclusive":true,"version_end":"13.1-64.23","version_end_inclusive":false,"cpe23_uri":"cve5:citrix-netscaler:gateway:0:13.1-64.23"},{"vendor_slug":"citrix-netscaler","vendor_name":"Citrix NetScaler","product_slug":"gateway","product_name":"Gateway","version_start":"0","version_start_inclusive":true,"version_end":"14.1-73.37","version_end_inclusive":false,"cpe23_uri":"cve5:citrix-netscaler:gateway:0:14.1-73.37"}],"exploit_refs":[],"news":[{"id":2254,"source":"The Hacker News","url":"https://thehackernews.com/2026/09/citrix-netscaler-cve-2026-88772-exploit.html","title":"Citrix NetScaler CVE-2026-88772 Exploit Details Show Pre-Auth Path to Shellcode Execution","summary":"Cybersecurity researchers have disclosed technical details of a recently patched critical security flaw in Citrix NetScaler ADC and Gateway that has come under active exploitation in the wild.\n\nThe vulnerability, tracked as CVE-2026-88772 (CVSS score: 9.5), has been described as a memory overflow bug in the Datagram Transport Layer Security (DTLS) protocol handling that's rooted in the NetScaler","thumbnail_url":"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcFl1djJdJQkamdMtV0xibSpzc4ahUKNoVKtVoDSeKFJAYUkH2SnmxalYIJpaVZ9cywBJqyUflBrXWbhTIzpwL51iIyfINyH7z7YUHqDl3IbAJJmpCANlw8YvFFtmLa3T2es4rdE70Jd9tEUYAbuWFuXVBsx6Ar2radG2ZhgkqjBA5ZErCm0xVhNPv6d3F/s1600/watch-exploit.jpg","author":"info@thehackernews.com (The Hacker News)","published_at":"2026-09-30T05:30:30Z","fetched_at":"2026-09-30T07:06:54.585308Z","trending_score":0.00013088020544644,"cve_ids":["CVE-2026-88772"]},{"id":2245,"source":"BleepingComputer","url":"https://www.bleepingcomputer.com/news/security/hackers-exploit-citrix-netscaler-zero-day-to-deploy-web-shells/","title":"Hackers exploit Citrix NetScaler zero-day to deploy web shells","summary":"Cybersecurity firms say attackers exploited the Citrix NetScaler CVE-2026-88772 zero-day to deploy custom web shells and tunneling malware, gain root access, steal credentials, and spread into internal networks. [...]","thumbnail_url":null,"author":"Lawrence Abrams","published_at":"2026-09-29T18:37:12Z","fetched_at":"2026-09-29T19:06:54.446741Z","trending_score":0.00012115751201947973,"cve_ids":["CVE-2026-88772"]}],"references":[{"url":"https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096&articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778","source_type":"MISC","tags":[]}],"timeline":[{"type":"cisa_reported","at":"2026-09-27T00:00:00Z","label":"Added to CISA KEV catalog","source":"kev"},{"type":"published","at":"2026-09-27T16:09:56.033000Z","label":"CVE published","source":null},{"type":"first_article","at":"2026-09-29T18:37:12Z","label":"First news coverage","source":"BleepingComputer"},{"type":"cvss_changed","at":"2026-10-02T10:03:01.593453Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-10-02T10:03:01.593453Z","label":"CVSS score revised","source":"nvd"},{"type":"cvss_changed","at":"2026-10-02T10:03:01.593453Z","label":"CVSS score revised","source":"nvd"}]}