{"id":"CVE-2021-22955","aliases":["EUVD-2021-10081","GHSA-xwgf-rg8j-2j5x"],"status":"published","title":"A unauthenticated denial of service vulnerability exists in Citrix ADC \u003c13.0-83.27, \u003c12.1-63.22...","description":"A unauthenticated denial of service vulnerability exists in Citrix ADC \u003c13.0-83.27, \u003c12.1-63.22 and 11.1-65.23 when configured as a VPN (Gateway) or AAA virtual server could allow an attacker to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.0092,"percentile":0.60572,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2021-12-07T13:12:33Z","modified":"2026-06-17T03:38:06Z","products":[{"vendor":"citrix","product":"application_delivery_controller_firmware"},{"vendor":"citrix","product":"gateway"}],"references":[{"url":"https://support.citrix.com/article/CTX330728","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-22955"},{"url":"https://github.com/advisories/GHSA-xwgf-rg8j-2j5x"}],"sources":{"cve":[{"id":"CVE-2021-22955","description":"A unauthenticated denial of service vulnerability exists in Citrix ADC \u003c13.0-83.27, \u003c12.1-63.22 and 11.1-65.23 when configured as a VPN (Gateway) or AAA virtual server could allow an attacker to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.","status":"published","published":"2021-12-07T13:12:33Z","modified":"2024-08-03T18:58:25.965Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:32:58.028461Z"}],"euvd":[{"id":"EUVD-2021-10081","description":"A unauthenticated denial of service vulnerability exists in Citrix ADC \u003c13.0-83.27, \u003c12.1-63.22 and 11.1-65.23 when configured as a VPN (Gateway) or AAA virtual server could allow an attacker to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.","status":"published","published":"2021-12-07T13:12:33Z","modified":"2024-08-03T18:58:25Z","updated_at":"2026-11-03T03:25:01.154097Z"}],"ghsa":[{"id":"GHSA-xwgf-rg8j-2j5x","title":"A unauthenticated denial of service vulnerability exists in Citrix ADC \u003c13.0-83.27, \u003c12.1-63.22...","description":"A unauthenticated denial of service vulnerability exists in Citrix ADC \u003c13.0-83.27, \u003c12.1-63.22 and 11.1-65.23 when configured as a VPN (Gateway) or AAA virtual server could allow an attacker to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.","status":"published","published":"2021-12-08T00:01:36Z","modified":"2023-02-01T05:07:00Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:50:27.906349Z"}],"nvd":[{"id":"CVE-2021-22955","description":"A unauthenticated denial of service vulnerability exists in Citrix ADC \u003c13.0-83.27, \u003c12.1-63.22 and 11.1-65.23 when configured as a VPN (Gateway) or AAA virtual server could allow an attacker to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.","status":"published","published":"2021-12-07T14:15:08.89Z","modified":"2026-06-17T03:38:06.187Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:07:01.811115Z"}]}}