{"id":"CVE-2023-3519","kind":"vulnerability","aliases":["CVE-2023-3519"],"related":[],"title":"Unauthenticated remote code execution","description":"Citrix NetScaler ADC and NetScaler Gateway contains a code injection vulnerability that allows for unauthenticated remote code execution.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"Citrix NetScaler ADC and NetScaler Gateway contain a code injection flaw that lets an unauthenticated remote attacker run code on the appliance. CISA lists it as actively exploited, with ransomware use noted in the catalog.","severity":"critical","cvss":9.8,"epss":null,"exploited":true,"exploited_at":"2023-07-19T00:00:00+00:00","products":[{"name":"Citrix NetScaler ADC and NetScaler Gateway","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"citrix netscaler application delivery controller","fixed":["12.1-55.297"],"affected":">= 12.1, < 12.1-55.297","ecosystem":"vendor"},{"name":"citrix netscaler application delivery controller","fixed":["13.0-91.13"],"affected":">= 13.0, < 13.0-91.13","ecosystem":"vendor"},{"name":"citrix netscaler application delivery controller","fixed":["13.1-37.159"],"affected":">= 13.1, < 13.1-37.159","ecosystem":"vendor"},{"name":"citrix netscaler application delivery controller","fixed":["13.1-49.13"],"affected":">= 13.1, < 13.1-49.13","ecosystem":"vendor"},{"name":"citrix netscaler gateway","fixed":["13.0-91.13"],"affected":">= 13.0, < 13.0-91.13","ecosystem":"vendor"},{"name":"citrix netscaler gateway","fixed":["13.1-49.13"],"affected":">= 13.1, < 13.1-49.13","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["citrix","exploited","gateway","infrastructure","netscaler","ransomware","self-hosted"],"not_affected_if":["managed-hosting"],"how_to_check":null,"fix":"Apply the mitigations or fixed build per Citrix vendor instructions; the sources do not name the versions.\nIf no mitigation is available, discontinue use of the product per CISA guidance.","status":"open","published_at":"2023-07-19T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:04:54+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"infrastructure","confidence":0.8,"triage":{"at":"2026-10-23T21:04:54Z","model":"claude-haiku-5-5","output":{"fix":"Apply the mitigations or fixed build per Citrix vendor instructions; the sources do not name the versions.\nIf no mitigation is available, discontinue use of the product per CISA guidance.","reach":"internet","impact":"high","summary":"Citrix NetScaler ADC and NetScaler Gateway contain a code injection flaw that lets an unauthenticated remote attacker run code on the appliance. CISA lists it as actively exploited, with ransomware use noted in the catalog.","category":"infrastructure","who_cares":["netscaler","citrix","gateway","self-hosted"],"confidence":0.8,"needs_auth":"no","worst_case":"Unauthenticated attacker runs code on the gateway appliance, enabling network takeover.","analyst_note":"Find affected and fixed versions and the Citrix mitigation steps (Citrix security bulletin CTX561482) and a host check command, since the sources give none.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["managed-hosting"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000482,"input_tokens":2852,"output_tokens":394,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2023':6A,9A '-3519':7A,10A 'action':107C 'activ':78B 'adc':13A,54B,89C 'allow':99C 'and':14A 'appli':108C 'applianc':73B 'application':19A,24A,29A,34A 'attack':68B 'catalog':86B 'cisa':74B,105C 'citrix':11A,17A,22A,27A,32A,37A,40A,43B,52B,87C 'code':3A,60B,70B,95C,103C 'contain':58B,93C 'controller':21A,26A,31A,36A 'cve':5A,8A 'delivery':20A,25A,30A,35A 'discontinu':114C 'execut':4A,104C 'exploit':44B,79B 'flaw':62B 'gateway':16A,39A,42A,45B,57B,92C 'host':51B 'infrastructur':46B 'inject':61B,96C 'instruct':112C 'let':64B 'list':75B 'mitig':109C,120C 'netscal':47B,53B,56B,88C,91C 'netscaler':12A,15A,18A,23A,28A,33A,38A,41A 'note':83B 'per':110C 'product':118C 'ransomwar':48B,81B 'remot':2A,67B,102C 'requir':106C 'run':69B 'self':50B 'self-host':49B 'unauthent':1A,66B,101C 'unavail':122C 'use':82B,115C 'vendor':111C 'vulner':97C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2023-07-19T00:00:00+00:00","kev":{"dateAdded":"2023-07-19","dueDate":"2023-08-09","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@citrix.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2023-3519","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-3519","severity":null,"published_at":"2023-07-19T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T16:39:47+00:00","note":null},{"source":"nvd","external_id":"CVE-2023-3519","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3519","severity":null,"published_at":"2023-07-19T18:15:11+00:00","modified_at":"2026-08-05T05:16:39+00:00","first_seen_at":"2026-10-23T22:29:04+00:00","fetched_at":"2026-10-23T22:29:04+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}