{"id":"CVE-2021-21828","aliases":["EUVD-2021-8999","GHSA-4w6g-h3j2-26jm"],"status":"published","title":"A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock...","description":"A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT\u0026T Labs Xmill 0.7. In the default case of DecodeTreeBlock a label is created via CurPath::AddLabel in order to track the label for later reference. An attacker can provide a malicious file to trigger this vulnerability.","severity":{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01136,"percentile":0.66935,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120","CWE-787"],"published":"2021-08-20T21:03:23Z","modified":"2026-06-17T03:36:11Z","products":[{"vendor":"att","product":"xmill"}],"references":[{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2021-1291","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21828"},{"url":"https://github.com/advisories/GHSA-4w6g-h3j2-26jm"}],"sources":{"cve":[{"id":"CVE-2021-21828","description":"A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT\u0026T Labs Xmill 0.7. In the default case of DecodeTreeBlock a label is created via CurPath::AddLabel in order to track the label for later reference. An attacker can provide a malicious file to trigger this vulnerability.","status":"published","published":"2021-08-20T21:03:23Z","modified":"2024-08-03T18:23:29.517Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:33:00.137099Z"}],"euvd":[{"id":"EUVD-2021-8999","description":"A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT\u0026T Labs Xmill 0.7. In the default case of DecodeTreeBlock a label is created via CurPath::AddLabel in order to track the label for later reference. An attacker can provide a malicious file to trigger this vulnerability.","status":"published","published":"2021-08-20T21:03:23Z","modified":"2024-08-03T18:23:29Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T03:25:04.672228Z"}],"ghsa":[{"id":"GHSA-4w6g-h3j2-26jm","title":"A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock...","description":"A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT\u0026T Labs Xmill 0.7. In the default case of DecodeTreeBlock a label is created via CurPath::AddLabel in order to track the label for later reference. An attacker can provide a malicious file to trigger this vulnerability.","status":"published","published":"2022-05-24T19:11:51Z","modified":"2023-01-30T05:01:36Z","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"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:46:26.905827Z"}],"nvd":[{"id":"CVE-2021-21828","description":"A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT\u0026T Labs Xmill 0.7. In the default case of DecodeTreeBlock a label is created via CurPath::AddLabel in order to track the label for later reference. An attacker can provide a malicious file to trigger this vulnerability.","status":"published","published":"2021-08-20T22:15:07.153Z","modified":"2026-06-17T03:36:11.49Z","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":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"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-120","CWE-787"],"updated_at":"2026-11-02T14:06:57.318236Z"}]}}