{"id":"CVE-2021-42127","aliases":["EUVD-2021-29112","GHSA-5cxv-f998-83v8"],"status":"published","title":"A deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 using...","description":"A deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 using Inforail Service allows arbitrary code execution via Data Repository Service.","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-12","score":0.65833,"percentile":0.9928,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-502"],"published":"2021-12-07T13:13:01Z","modified":"2026-06-17T04:09:23Z","products":[{"vendor":"ivanti","product":"avalanche"}],"references":[{"url":"https://forums.ivanti.com/s/article/Security-Alert-CVE-s-Addressed-in-Avalanche-6-3-3","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42127"},{"url":"https://github.com/advisories/GHSA-5cxv-f998-83v8"}],"sources":{"cve":[{"id":"CVE-2021-42127","description":"A deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 using Inforail Service allows arbitrary code execution via Data Repository Service.","status":"published","published":"2021-12-07T13:13:01Z","modified":"2024-08-04T03:30:37.722Z","cwes":["CWE-502"],"updated_at":"2026-11-02T14:32:58.739039Z"}],"euvd":[{"id":"EUVD-2021-29112","description":"A deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 using Inforail Service allows arbitrary code execution via Data Repository Service.","status":"published","published":"2021-12-07T13:13:01Z","modified":"2024-08-04T03:30:37Z","updated_at":"2026-11-03T03:24:16.217613Z"}],"ghsa":[{"id":"GHSA-5cxv-f998-83v8","title":"A deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 using...","description":"A deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 using Inforail Service allows arbitrary code execution via Data Repository Service.","status":"published","published":"2021-12-08T00:01:32Z","modified":"2023-02-01T05:06:46Z","cwes":["CWE-502"],"updated_at":"2026-11-02T14:50:25.046492Z"}],"nvd":[{"id":"CVE-2021-42127","description":"A deserialization of untrusted data vulnerability exists in Ivanti Avalanche before 6.3.3 using Inforail Service allows arbitrary code execution via Data Repository Service.","status":"published","published":"2021-12-07T14:15:09.25Z","modified":"2026-06-17T04:09:23.587Z","cvss":[{"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"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:07:01.811115Z"}]}}