{"id":"CVE-2022-27518","published":"2022-12-13T17:15:14Z","modified":"2026-06-17T04:37:09Z","title":"Citrix Application Delivery Controller (ADC) and Gateway Authentication Bypass Vulnerability","vendor":"Citrix","product":"Application Delivery Controller (ADC) and Gateway","tier":"core","eol":null,"description":{"text":"Unauthenticated remote arbitrary code execution","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is an authentication bypass in Citrix Application Delivery Controller (ADC) and Gateway, arising from improper control of a resource through its lifetime. An unauthenticated remote attacker can achieve arbitrary code execution over the network, with no user interaction and no prior authentication required.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:11:08Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.06858,"percentile":0.94029,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2022-12-13","dueDate":"2023-01-03","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://www.citrix.com/blogs/2022/12/13/critical-security-update-now-available-for-citrix-adc-citrix-gateway/;  https://nvd.nist.gov/vuln/detail/CVE-2022-27518","provenance":"source"},"vulncheckKev":{"dateAdded":"2022-12-13","exploitedFirstSeen":"2022-12-13","ransomware":false,"evidence":[{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2022-12-13"},{"url":"https://media.defense.gov/2022/Dec/13/2003131586/-1/-1/0/CSA-APT5-CITRIXADC-V1.PDF","date":"2022-12-13"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-12-13"},{"url":"https://www.prio-n.com/a-year-in-review-2022-100-vulnerabilities-you-should-prioritize/","date":"2023-02-02"},{"url":"https://hub.dragos.com/hubfs/312-Year-in-Review/2022/Dragos_Year-In-Review-Report-2022.pdf","date":"2023-02-14"},{"url":"https://go.recordedfuture.com/hubfs/reports/ta-2023-0302.pdf","date":"2023-03-02"},{"url":"https://www.mandiant.com/resources/blog/zero-days-exploited-2022","date":"2023-03-20"},{"url":"https://www.mandiant.com/resources/blog/chinese-espionage-tactics","date":"2023-07-18"},{"url":"https://www.microsoft.com/content/dam/microsoft/final/en-us/microsoft-brand/documents/MDDR_FINAL_2023_1004.pdf","date":"2023-10-09"},{"url":"https://go.recordedfuture.com/hubfs/reports/cta-2023-1107.pdf","date":"2023-11-07"}],"evidenceTotal":11,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-664","name":"Improper Control of a Resource Through its Lifetime"}],"references":[{"url":"https://support.citrix.com/article/CTX474995","tags":["Vendor Advisory"]},{"url":"https://support.citrix.com/article/CTX474995","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-27518","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Unauthenticated remote exploit of public-facing appliance","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"Unauthenticated remote arbitrary code execution","start":0,"end":47}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Arbitrary code execution is the direct impact","mappingType":"primary_impact","evidence":[{"from":"description","quote":"Unauthenticated remote arbitrary code execution","start":0,"end":47}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-3e073c1a9a3147fb5188","title":"IOC Extinction? China-Nexus Cyber Espionage Actors Use ORB Networks to Raise Cost on Defenders","publisher":"cloud.google.com","url":"https://cloud.google.com/blog/topics/threat-intelligence/china-nexus-espionage-orb-networks","date":null,"mentions":[{"quote":"Active since at least 2019, UNC2630 (with suspected links to APT5), used a known SPACEHOP node to exploit CVE-2022-27518 in late December 2022.","start":11716,"end":11859},{"quote":"The National Security Agency (NSA) linked exploitation of CVE-2022-27518 within the same time frame to APT5.","start":11860,"end":11968}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2022-32019","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-32019","exploited":true,"exploitedSince":"2022-12-13","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2023-01-17","earliestUrl":"https://github.com/dolby360/CVE-2022-27518_POC","repos":[{"name":"dolby360/CVE-2022-27518_POC","url":"https://github.com/dolby360/CVE-2022-27518_POC","stars":2,"created":"2023-01-17"}]},"first":{"date":"2023-01-17","source":"PoC-in-GitHub","url":"https://github.com/dolby360/CVE-2022-27518_POC"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2022-12-13","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-27518","provenance":"source"},{"date":"2022-12-13","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","provenance":"source"},{"date":"2022-12-13","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-12-13","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-32019","provenance":"source"},{"date":"2023-01-17","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/dolby360/CVE-2022-27518_POC","provenance":"source"}],"speed":{"daysToPublicExploit":35,"firstExploitFrom":"PoC-in-GitHub","daysToKev":0},"priority":{"score":72.5,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1416 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":18.81,"detail":"percentile 0.9403"},{"name":"Named in threat reports","points":3.87,"detail":"1 report"},{"name":"Public exploit code","points":5.0,"detail":"1 PoC-in-GitHub repo"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}